Despite: "Maturity level/Rock solid - Useable and hasn't had bugs for a 
long time."

The following occurs reproducibly on a bog-standard winXPSP2 box:

* Install Squeak3.9-final-7067
* Install squeak-dev-72-2
* Launch squeak-dev-72-2.image
* World menu -> old desktop menu -> open ... -> SqueakMap Package Loader
* Select 15-Puzzle (-> 1.1)
* Menu -> first two items are "install" and "email package maintainers"
* Latter produces the "gaelli@" email address I'm copying this to
* Former produces "error occurred during install". Puzzle appears anyway
* Scramble and unscramble puzzle works normally
* World menu -> old desktop menu -> previous project returns to main
   world
* There a debugger can be seen. Bug report below. Upshot: seems a
   Player56 instance's scripts ivar is ending up an integer instead of an
   IdentityDictionary.
* Open a system browser and find some method. Pick senders of. Pick a
   method. Witness "primitive failed" debugger.
* Cause is a corrupt CompiledMethod object; senders grovels over all
   compiled methods in the system. This particular CompiledMethod object
   is for Player57's setEmptyCell: method.
* Yes -- that would be *your* Player57 class, Gaelli. :)
* To recover normal behavior, unloading the "1415 Puzzle" world seems
   called-for. X the window and get another attempt to invoke an
   IdentityDictionary method on a SmallInteger.
* Do a little digging and discover that Player56 can have its "scripts"
   ivar reset with jettisonScripts
* Open an inspector on the Player56 instance causing all the trouble and
   eval "self jettisonScripts"
* The icing on the cake: clicking the "1415 Puzzle" world window to try
   again to close it now crashes the VM(!).

At least 4 separate bugs here.
* In 15-Puzzle 1.1: package install/startup constructs a Player56 with
   an integer in place of an IdentityDictionary in "scripts" ivar (ivar
   defined in superclass Player).
* Somehow, this causes a corrupt CompiledMethod for
   Player57>>setEmptyCell: to exist. Curiously, a normal version coexists
   with it! I suspect this is a VM error involving a dangling pointer.
   This may in turn indicate a Slang-to-C translator error.
* In VM, something that causes a crash. It is probably the same or
   another dangling pointer.
* In system tools: a single corrupt CompiledMethod makes "senders of"
   functionality useless. No failover. ("Proceed" causes the same corrupt
   method to keep popping up errors, apparently in an infinite loop.)
   In the particular case caused by the 15 puzzle, the CompiledMethod
   ends up with a "numLiterals" of zero (the proximate cause of the
   primitive failure) and a class that is an integer instead of a Class,
   FWIW. In any event, the system tools should provide some ability to
   recover, perhaps by ignoring or logging corrupt methods.

15 puzzle bug (generated bug report for the error during install):

10 January 2007 2:52:02 am

VM: Win32 - a SmalltalkImage
Image: Squeak3.9 [latest update: #7067]

SecurityManager state:
Restricted: false
FileAccess: true
SocketAccess: true
Working Dir C:\squeak
Trusted Dir C:\squeak\HP_Administrator
Untrusted Dir C:\My Squeak\HP_Administrator

SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
	Receiver: 89276551
	Arguments and temporary variables:
		aMessage: 	removeKey: nil ifAbsent: [] in Player56 class(Player 
class)>>cleanseS...etc...
	Receiver's instance variables:
89276551

Player56 class(Player class)>>cleanseScriptsOfNilKeys
	Receiver: Player56
	Arguments and temporary variables:

	Receiver's instance variables:
		superclass: 	Player
		methodDict: 	a MethodDictionary(#moveNumber->a CompiledMethod (1619) )
		format: 	136
		instanceVariables: 	nil
		organization: 	('scripts' moveNumber)

		subclasses: 	nil
		name: 	#Player56
		classPool: 	nil
		sharedPools: 	nil
		environment: 	a SystemDictionary(lots of globals)
		category: 	#UserObjects
		traitComposition: 	an IdentityDictionary(#moveNumber->A UniclassScript 
- selecto...etc...
		localSelectors: 	an IdentityDictionary()
		scripts: 	<<error during printing>>

Player56 class(Player class)>>scripts
	Receiver: Player56
	Arguments and temporary variables:

	Receiver's instance variables:
		superclass: 	Player
		methodDict: 	a MethodDictionary(#moveNumber->a CompiledMethod (1619) )
		format: 	136
		instanceVariables: 	nil
		organization: 	('scripts' moveNumber)

		subclasses: 	nil
		name: 	#Player56
		classPool: 	nil
		sharedPools: 	nil
		environment: 	a SystemDictionary(lots of globals)
		category: 	#UserObjects
		traitComposition: 	an IdentityDictionary(#moveNumber->A UniclassScript 
- selecto...etc...
		localSelectors: 	an IdentityDictionary()
		scripts: 	<<error during printing>>

Player56(Player)>>methodInterfacesForScriptsCategoryIn:
	Receiver: a Player56 (3795) named Cell16
	Arguments and temporary variables:
		aVocabulary: 	an EToyVocabulary named "eToy"
		myScripts: 	nil
		us: 	nil
	Receiver's instance variables:
		dependents: 	nil
		costume: 	a PasteUpMorph<Cell16>(2009)
		costumes: 	nil


--- The full stack ---
SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
Player56 class(Player class)>>cleanseScriptsOfNilKeys
Player56 class(Player class)>>scripts
Player56(Player)>>methodInterfacesForScriptsCategoryIn:
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Player56(Object)>>methodInterfacesForCategory:inVocabulary:limitClass:
Player56(Object)>>tilePhrasesForCategory:inViewer:
CategoryViewer>>categoryWording:
CategoryViewer>>chosenCategorySymbol:
CategoryViewer>>chooseCategoryWhoseTranslatedWordingIs:
CategoryViewer>>initializeFor:categoryChoice:
StandardViewer>>categoryViewerFor:
StandardViewer>>addCategoryViewerFor:atEnd:
StandardViewer>>addCategoryViewerFor:
StandardViewer>>addCategoryViewer
StandardViewer>>initializeFor:barHeight:includeDismissButton:showCategories:
StandardViewer>>initializeFor:barHeight:includeDismissButton:
StandardViewer>>initializeFor:barHeight:
Presenter>>viewMorph:
ViewerFlapTab>>unhibernate
ViewerFlapTab(FlapTab)>>adaptToWorld
[] in PasteUpMorph>>installFlaps {[:aFlapTab | aFlapTab adaptToWorld]}
OrderedCollection>>do:
PasteUpMorph>>installFlaps
PasteUpMorph>>install
Project>>enter:revert:saveForRevert:
Project>>enter
ProjectEntryNotification>>defaultAction
UndefinedObject>>handleSignal:
MethodContext(ContextPart)>>handleSignal:
MethodContext(ContextPart)>>handleSignal:
MethodContext(ContextPart)>>handleSignal:
MethodContext(ContextPart)>>handleSignal:
MethodContext(ContextPart)>>handleSignal:
ProjectEntryNotification(Exception)>>signal
ProjectEntryNotification(Exception)>>signal:
ProjectEntryNotification class>>signal:
ProjectLoading class>>openName:stream:fromDirectory:withProjectView:
[] in ProjectLoading class>>openFromDirectory:andFileName: 
{[ProgressNotification signal: '1:foundMostRecent'.  fileAndDir := self 
bestA...]}
BlockContext>>on:do:
[] in ComplexProgressIndicator>>withProgressDo: {[aBlock   on: 
ProgressInitiationException   do: [:ex | ex     sendNotificati...]}
BlockContext>>on:do:
ComplexProgressIndicator>>withProgressDo:
ProjectLoading class>>openFromDirectory:andFileName:
[] in SMProjectInstaller>>install {[ProjectLoading openFromDirectory: 
dir andFileName: fileName]}
...etc...



The VM crash log curiously indicates the VM version to be quite a bit 
earlier than 3.9. Possible there's a mismatch between squeak-dev and 
squeak? I downloaded the latest of both, after determining that 
squeak-dev by itself was not a complete Squeak install. In fact, there's 
an even more embarrassing fifth bug -- install just Squeak 3.9 7067 
directly from the zip to any directory, drag the 7067 image into the 
executable, click Workspace, and click "SMLoader open" in Workspace -- 
guess what? SmallInteger doesNotUnderstand: #numbers ... is there a 
pattern here? Everything seems to boil down to SmallIntegers in places 
where they don't belong. I'm starting to suspect that the system is 
mistaking object pointers for integers and integers for object pointers 
here and there. That would explain everything, including the VM crashes. 
It would also betray a serious lack of testing and polish, unless it's a 
weird system-dependent bug, but Squeak should be well tested on x86 boxen.

FWIW, system specs are:
CPU: AMD64 dual-core XP2000
OS: Windows XP MCE, 32-bit, SP2
Video: eVGA -> nVidia GeForce GS6800
Sound: some generic POS, not actually exercised in the occurring of 
these crashes
Memory: about 3/4 of 1GB in use and 1/4 free according to Task Manager
Disk: about 2/5 of 250GB free

Version of Squeak downloaded was Win32 (I didn't see a win64 one anyway, 
not that it would likely have worked).

Log from an instance of the VM crash:

---------------------------------------------------------------------
Wed Jan 10 02:38:50 2007

Exception code: C0000005
Exception addr: 00412165
Access violation (read access) at 054DFFC8
EAX:054DFFC8	EBX:0267441C	ECX:026795C4	EDX:00000000
ESI:005203F0	EDI:018DED7C	EBP:0006FC50	ESP:0006FC1C
EIP:00412165	EFL:00010212
FP Control: FFFF037F
FP Status:  FFFF4020
FP Tag:     FFFFFFFF
VM Version: Squeak 3.7.1 (release) from Sep 23 2004
Compiler: gcc 2.95.2 19991024 (release)

Current byte code: 209
Primitive index: 77

Loaded plugins:
	DSAPrims 23 September 2004 (i)
	ZipPlugin 23 September 2004 (i)
	SocketPlugin 23 September 2004 (i)
	LargeIntegers v1.3 23 September 2004 (i)
	Matrix2x3Plugin 23 September 2004 (i)
	FloatArrayPlugin 23 September 2004 (i)
	B2DPlugin 23 September 2004 (i)
	BitBltPlugin 23 September 2004 (i)
	SecurityPlugin 23 September 2004 (i)
	FilePlugin 23 September 2004 (i)
	MiscPrimitivePlugin 23 September 2004 (i)


Stack dump:

53568028 Behavior>allInstancesDo:
53567116 Behavior>allSubInstancesDo:
53567684 [] in Project>enter:revert:saveForRevert:
53566956 Dictionary>at:ifPresentAndInMemory:
48568348 Project>enter:revert:saveForRevert:
48569980 ProjectViewMorph>enter
48569888 ProjectViewMorph>mouseUp:
48569756 Morph>handleMouseUp:
48569664 MouseButtonEvent>sentTo:
48569572 Morph>handleEvent:
48569204 Morph>handleFocusEvent:
48569296 [] in HandMorph>sendFocusEvent:to:clear:
48569388 [] in PasteUpMorph>becomeActiveDuring:
48569112 BlockContext>on:do:
48569020 PasteUpMorph>becomeActiveDuring:
48568836 HandMorph>sendFocusEvent:to:clear:
48568744 HandMorph>sendEvent:focus:clear:
48568652 HandMorph>sendMouseEvent:
48568256 HandMorph>handleEvent:
48567936 HandMorph>processEvents
48568028 [] in WorldState>doOneCycleNowFor:
48567844 SequenceableCollection>do:
48567752 WorldState>handsDo:
48567660 WorldState>doOneCycleNowFor:
48567568 WorldState>doOneCycleFor:
48567476 PasteUpMorph>doOneCycle
48216052 [] in >spawnNewProcess
48216236 [] in BlockContext>newProcess

---------------------------------------------------------------------
Wed Jan 10 03:02:09 2007

Exception code: C0000005
Exception addr: 00427242
Access violation (read access) at 15797480
EAX:0ABCBA40	EBX:81BF3194	ECX:026C99E0	EDX:026CD798
ESI:00001378	EDI:00520580	EBP:00520580	ESP:0006FB64
EIP:00427242	EFL:00010202
FP Control: FFFF037F
FP Status:  FFFF0120
FP Tag:     FFFFFFFF
VM Version: Squeak 3.7.1 (release) from Sep 23 2004
Compiler: gcc 2.95.2 19991024 (release)

Current byte code: 46
Primitive index: 71

Loaded plugins:
	SocketPlugin 23 September 2004 (i)
	ZipPlugin 23 September 2004 (i)
	DSAPrims 23 September 2004 (i)
	LargeIntegers v1.3 23 September 2004 (i)
	Matrix2x3Plugin 23 September 2004 (i)
	FloatArrayPlugin 23 September 2004 (i)
	B2DPlugin 23 September 2004 (i)
	BitBltPlugin 23 September 2004 (i)
	SecurityPlugin 23 September 2004 (i)
	FilePlugin 23 September 2004 (i)
	MiscPrimitivePlugin 23 September 2004 (i)


Stack dump: