This has been a long standing 'niggle' with me and I wonder if it has
bothered anybody else or it's my fault! Once I've hit the problem it always
comes back, although non-fatal it is puzzling. Here is a dump of the
situation from the walkback window...

----------- dump -------------
Image version: Squeak3.1beta
latest update: #4478
Current Change Set: MusicSystem

VM version: Squeak3.1alpha of 4 February 2001 [latest update: #3748]
for: Win32

Receiver: an EventSensor

Instance variables:
mouseButtons:  0
mousePosition:  194 at 275
keyboardBuffer:  a SharedQueue
interruptKey:  2094
interruptSemaphore:  a Semaphore(a Process in
EventSensor(InputSensor)>>userInterruptWatcher)
eventQueue:  a SharedQueue
inputProcess:  a Process in Semaphore>>waitTimeoutMSecs:
inputSemaphore:  a Semaphore(a Process in Semaphore>>waitTimeoutMSecs:)

Method (temp) variables:

Stack:
UndefinedObject(Object)>>doesNotUnderstand:
EventSensor>>nextEventFromQueue
EventSensor>>nextEvent
HandMorph>>processEvents
[] in WorldState>>doOneCycleNowFor:
Array(SequenceableCollection)>>do:
WorldState>>handsDo:
WorldState>>doOneCycleNowFor:
WorldState>>doOneCycleFor:
PasteUpMorph>>doOneCycle
[] in Project class>>spawnNewProcess
[] in BlockContext>>newProcess

--------------- end --------------

What was I doing? Nothing! It happens as soon as I start my image up. The
problem only seems to start after swimming around a new clean image. Any
offers?

I *know why* it went bang and once upon a time I even put an [] :ifError[]
around some code in here...

EventSensor>>nextEventFromQueue
 "Return the next event from the receiver."
 eventQueue isEmpty
  ifTrue: [inputSemaphore signal].
 EventPollFrequency _ 500.
 "since Squeak is taking the event, reset to normal delay"

 ">>>my change..."
 [ eventQueue isEmpty
  ifTrue: [^ nil]
  ifFalse: [^ eventQueue next]] ifError: [ ^nil ].
 ">>>...end my change"

which 'removed' the walkback but I noticed that every time I saved the image
or pretty much did anything else, the cursor kept switching to the 'buy in
background' shape. Any explanationas would be most welcome!

Sean Charles.