Once the image is saved with an external screen attached it can not be opened again with that external screen disconnected:

``` Segmentation fault Mon Jan 6 14:45:41 2020

VM: 201911282316 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Thu Nov 28 15:16:31 2019 CommitHash: 4710c5a Plugins: 201911282316 https://github.com/OpenSmalltalk/opensmalltalk-vm.git

C stack backtrace & registers: rax 0x0000000000000000 rbx 0x0000000000000000 rcx 0x0000000000002800 rdx 0x00007fff2b4adb00 rdi 0x0000004110a2b400 rsi 0x00000002238ea538 rbp 0x00007ffee80666b0 rsp 0x00007ffee8066698 r8 0x0000000000000008 r9 0x0000000000000571 r10 0x0000000000000a00 r11 0x0000000000000000 r12 0x0000000000000000 r13 0x0000000000000000 r14 0x0000000000000008 r15 0x0000000000000000 rip 0x00007fff2b401f95 0 AMDMTLBronzeDriver 0x00007fff2b401f95 _ZL30amdMtlBronzeWritePixelByPixel2PvS_PA8_Khjjjj + 44 1 Pharo 0x0000000107bf5ee1 reportStackState + 818 2 Pharo 0x0000000107bf6235 sigsegv + 195 3 libsystem_platform.dylib 0x00007fff6e22db1d _sigtramp + 29 4 ??? 0x0000000000000000 0x0 + 0 5 AMDMTLBronzeDriver 0x00007fff2b400aec _ZL25bronzePartialTileCallbackyjjjPv + 180 6 AMDMTLBronzeDriver 0x00007fff2b3feb6d _Z34BronzeGenerateMicroTileAddresses2DPK24BronzeCpuTexInterfaceRecPK21ATIMipmapBufferHeaderjjjjjjjPFvyjjjPvES5_ + 1210 7 AMDMTLBronzeDriver 0x00007fff2b3ff695 _ZL35amdMtlBronzeTextureStdReplacePixelsPK24BronzeCpuTexInterfaceRecPK21ATIMipmapBufferHeaderPK18ati_si_format_infomjmmjjjjj + 288 8 AMDMTLBronzeDriver 0x00007fff2b3ff095 _ZL34amdMtlBronzeTextureStdAccessRegionPK24BronzeCpuTexInterfaceRecPFvS1_PK21ATIMipmapBufferHeaderPK18ati_si_format_infomjmmjjjjjES9_S4_S7_mjmmjjjjj + 645 9 AMDMTLBronzeDriver 0x00007fff2b3ff3f9 _Z35amdMtlBronzeTextureStdReplaceRegionPK24BronzeCpuTexInterfaceRecPK21ATIMipmapBufferHeaderPK18ati_si_format_infoPvjmmjjjjj + 286 10 AMDMTLBronzeDriver 0x00007fff2b42af52 -[BronzeMtlTexture replaceRegion:mipmapLevel:withBytes:bytesPerRow:] + 578 11 Pharo 0x0000000107bec0b0 -[sqSqueakOSXMetalView loadTexturesFrom:subRectangle:] + 437 12 Pharo 0x0000000107bebc81 -[sqSqueakOSXMetalView drawRect:] + 159 13 MetalKit 0x00007fff3c01b86b -[MTKView draw] + 159 14 Pharo 0x0000000107beb5a2 -[sqSqueakOSXMetalView drawThelayers] + 67 15 Pharo 0x0000000107bf7e9d -[sqSqueakScreenAndWindow ioForceDisplayUpdate] + 188 16 Pharo 0x0000000107bf7b92 ioForceDisplayUpdate + 61 17 Pharo 0x0000000107ba021a primitiveShowDisplayRect + 206 18 Pharo 0x0000000107b6a23c interpret + 17024 19 Pharo 0x0000000107b72aa6 enterSmalltalkExecutiveImplementation + 149 20 Pharo 0x0000000107b66232 interpret + 630 21 Pharo 0x0000000107bf7648 -[sqSqueakMainApplication runSqueak] + 393 22 Foundation 0x00007fff392f01cb __NSFirePerformWithOrder + 360 23 CoreFoundation 0x00007fff36ba566e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 24 CoreFoundation 0x00007fff36ba5594 __CFRunLoopDoObservers + 457 25 CoreFoundation 0x00007fff36b4872b __CFRunLoopRun + 1219 26 CoreFoundation 0x00007fff36b47fe3 CFRunLoopRunSpecific + 499 27 HIToolbox 0x00007fff356cf67d RunCurrentEventLoopInMode + 292 28 HIToolbox 0x00007fff356cf2c9 ReceiveNextEventCommon + 356 29 HIToolbox 0x00007fff356cf147 _BlockUntilNextEventMatchingListInModeWithFilter + 64 30 AppKit 0x00007fff33d54864 _DPSNextEvent + 990 31 AppKit 0x00007fff33d535d4 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352 32 AppKit 0x00007fff33d4dd76 -[NSApplication run] + 658 33 AppKit 0x00007fff33d3f95d NSApplicationMain + 777 34 libdyld.dylib 0x00007fff6e02c2e5 start + 1 35 ??? 0x0000000000000002 0x0 + 2

Smalltalk stack dump: 0x7ffee806bb20 I DisplayScreen>forceToScreen: 0x11580f4c0: a(n) DisplayScreen 0x7ffee806bb58 M [] in DisplayScreen>forceDamageToScreen: 0x11580f4c0: a(n) DisplayScreen 0x7ffee806bba0 M OrderedCollection>do: 0x114de0080: a(n) OrderedCollection 0x7ffee806bbf8 I DisplayScreen>forceDamageToScreen: 0x11580f4c0: a(n) DisplayScreen 0x7ffee806bc40 I VMWorldRenderer>forceDamageToScreen: 0x114a28f18: a(n) VMWorldRenderer 0x7ffee806bc90 M VMWorldRenderer>displayWorldState:ofWorld:submorphs: 0x114a28f18: a(n) VMWorldRenderer 0x7ffee806bce8 I WorldState>displayWorld:submorphs: 0x1158d6a60: a(n) WorldState 0x7ffee806bd38 I WorldMorph>displayWorld 0x1158cab48: a(n) WorldMorph 0x7ffee806bd90 I TaskbarMorph(Morph)>snapToEdgeIfAppropriate 0x115e9a7f0: a(n) TaskbarMorph 0x7ffee806bdd0 I TaskbarMorph>updateBounds 0x115e9a7f0: a(n) TaskbarMorph 0x7ffee8068928 I TaskbarMorph>displayExtentChanged 0x115e9a7f0: a(n) TaskbarMorph 0x7ffee8068958 M [] in VMWorldRenderer(AbstractWorldRenderer)>restoreMorphicDisplay 0x114a28f18: a(n) VMWorldRenderer 0x7ffee80689a0 M Array(SequenceableCollection)>do: 0x122cff900: a(n) Array 0x7ffee80689e8 I WorldMorph(Morph)>submorphsDo: 0x1158cab48: a(n) WorldMorph 0x7ffee8068a38 I VMWorldRenderer(AbstractWorldRenderer)>restoreMorphicDisplay 0x114a28f18: a(n) VMWorldRenderer 0x7ffee8068a78 I WorldMorph>restoreMorphicDisplay 0x1158cab48: a(n) WorldMorph 0x7ffee8068ac0 I MorphicUIManager>activate 0x114a28f08: a(n) MorphicUIManager 0x7ffee8068b08 I UIManager class>default: 0x1151cc508: a(n) UIManager class 0x7ffee8068b40 M UIManagerSessionHandler>startup: 0x1155b2618: a(n) UIManagerSessionHandler 0x7ffee8068b80 M [] in WorkingSession>runStartup: 0x114a28000: a(n) WorkingSession 0x7ffee8068bc8 M [] in WorkingSession>runList:do: 0x114a28000: a(n) WorkingSession 0x7ffee8068bf8 M BlockClosure>on:do: 0x114a3d618: a(n) BlockClosure 0x7ffee8068c40 M [] in WorkingSession>runList:do: 0x114a28000: a(n) WorkingSession 0x7ffee8068c88 M Array(SequenceableCollection)>do: 0x114a3d748: a(n) Array 0x7ffee8068cd0 I WorkingSession>runList:do: 0x114a28000: a(n) WorkingSession 0x7ffee8068d20 I WorkingSession>runStartup: 0x114a28000: a(n) WorkingSession 0x7ffee8068d68 I WorkingSession>start: 0x114a28000: a(n) WorkingSession 0x7ffee8068dc0 I SessionManager>launchSnapshot:andQuit: 0x11523de78: a(n) SessionManager 0x123935448 s [] in SessionManager>snapshot:andQuit: 0x123936578 s [] in BlockClosure>newProcess ```