Something to do with Clones, or Preview Windows, and or PixelMath.
*** Error: Unknown exception
*** PCL Unix Signal Handler: Critical signal caught (11): Segmentation violation
PixInsight 1.8.8-3 - Critical Signal Backtrace
Received signal 11 (SIGSEGV)
Module: 0 PixInsight 0x0000000103f0af4e InitializePixInsightModule + 1849342
================================================================================
47: 1 libsystem_platform.dylib 0x00007fff6b15c42d _sigtramp + 29
46: 2 ??? 0x000060000ec9ad10 0x0 + 105553364364560
45: 3 PixInsight 0x0000000103ccd1a2 PixInsight + 14520738
44: 4 QtWidgets 0x00000001050d1979 _ZN7QWidget5eventEP6QEvent + 1161
43: 5 QtWidgets 0x0000000105096c20 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 272
42: 6 QtWidgets 0x0000000105097fd5 _ZN12QApplication6notifyEP7QObjectP6QEvent + 581
41: 7 PixInsight 0x000000010302c0e4 PixInsight + 1278180
40: 8 QtCore 0x000000010e0f0094 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 212
39: 9 QtWidgets 0x00000001050d071d _ZN14QWidgetPrivate11show_helperEv + 413
38: 10 QtWidgets 0x00000001050d132c _ZN14QWidgetPrivate10setVisibleEb + 828
37: 11 PixInsight 0x0000000103bc52e1 PixInsight + 13439713
36: 12 PixInsight 0x00000001031aee91 PixInsight + 2862737
35: 13 PixInsight 0x00000001031b8aeb PixInsight + 2902763
34: 14 QtWidgets 0x00000001050d1692 _ZN7QWidget5eventEP6QEvent + 418
33: 15 QtWidgets 0x000000010517795b _ZN6QFrame5eventEP6QEvent + 43
32: 16 QtCore 0x000000010e0f032e _ZN23QCoreApplicationPrivate29sendThroughObjectEventFiltersEP7QObjectP6QEvent + 206
31: 17 QtWidgets 0x0000000105096c0b _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 251
30: 18 QtWidgets 0x0000000105099b86 _ZN12QApplication6notifyEP7QObjectP6QEvent + 7670
29: 19 PixInsight 0x000000010302c0e4 PixInsight + 1278180
28: 20 QtCore 0x000000010e0f0094 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 212
27: 21 QtWidgets 0x0000000105097547 _ZN19QApplicationPrivate14sendMouseEventEP7QWidgetP11QMouseEventS1_S1_PS1_R8QPointerIS0_Ebb + 903
26: 22 QtWidgets 0x00000001050f091f _ZN14QDesktopWidget11qt_metacallEN11QMetaObject4CallEiPPv + 9087
25: 23 QtWidgets 0x00000001050ef66a _ZN14QDesktopWidget11qt_metacallEN11QMetaObject4CallEiPPv + 4298
24: 24 QtWidgets 0x0000000105096c20 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 272
23: 25 QtWidgets 0x0000000105097fd5 _ZN12QApplication6notifyEP7QObjectP6QEvent + 581
22: 26 PixInsight 0x000000010302c0e4 PixInsight + 1278180
21: 27 QtCore 0x000000010e0f0094 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 212
20: 28 QtGui 0x000000010568ee61 _ZN22QGuiApplicationPrivate17processMouseEventEPN29QWindowSystemInterfacePrivate10MouseEventE + 3441
19: 29 QtGui 0x00000001056764bb _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 219
18: 30 libqcocoa.dylib 0x00000001061053e8 qt_plugin_instance + 180424
17: 31 CoreFoundation 0x00007fff33908b21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
16: 32 CoreFoundation 0x00007fff33908ac0 __CFRunLoopDoSource0 + 103
15: 33 CoreFoundation 0x00007fff339088d4 __CFRunLoopDoSources0 + 209
14: 34 CoreFoundation 0x00007fff33907740 __CFRunLoopRun + 1272
13: 35 CoreFoundation 0x00007fff33906bd3 CFRunLoopRunSpecific + 499
12: 36 HIToolbox 0x00007fff3245d65d RunCurrentEventLoopInMode + 292
11: 37 HIToolbox 0x00007fff3245d2a9 ReceiveNextEventCommon + 356
10: 38 HIToolbox 0x00007fff3245d127 _BlockUntilNextEventMatchingListInModeWithFilter + 64
9: 39 AppKit 0x00007fff30aceeb4 _DPSNextEvent + 990
8: 40 AppKit 0x00007fff30acd690 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352(+1352)
7: 41 AppKit 0x00007fff30abf3ae -[NSApplication run] + 658
6: 42 libqcocoa.dylib 0x0000000106104258 qt_plugin_instance + 175928
5: 43 QtCore 0x000000010e0eb63f _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 431
4: 44 QtCore 0x000000010e0f06e2 _ZN16QCoreApplication4execEv + 130
3: 45 PixInsight 0x00000001030446ec PixInsight + 1378028
2: 46 libdyld.dylib 0x00007fff6af637fd start + 1
1: 47 ??? 0x0000000000000001 0x0 + 1
================================================================================
*** PCL Unix Signal Handler: Critical signal caught (11): Segmentation violation
PixInsight 1.8.8-3 - Critical Signal Backtrace
Received signal 11 (SIGSEGV)
Module: 0 PixInsight 0x0000000103f0af4e InitializePixInsightModule + 1849342
================================================================================
41: 1 libsystem_platform.dylib 0x00007fff6b15c42d _sigtramp + 29
40: 2 ??? 0x0000000000000030 0x0 + 48
39: 3 QtWidgets 0x00000001050d0725 _ZN14QWidgetPrivate11show_helperEv + 421
38: 4 QtWidgets 0x00000001050d132c _ZN14QWidgetPrivate10setVisibleEb + 828
37: 5 PixInsight 0x0000000103bc52e1 PixInsight + 13439713
36: 6 PixInsight 0x00000001031aee91 PixInsight + 2862737
35: 7 PixInsight 0x00000001031b8aeb PixInsight + 2902763
34: 8 QtWidgets 0x00000001050d1692 _ZN7QWidget5eventEP6QEvent + 418
33: 9 QtWidgets 0x000000010517795b _ZN6QFrame5eventEP6QEvent + 43
32: 10 QtCore 0x000000010e0f032e _ZN23QCoreApplicationPrivate29sendThroughObjectEventFiltersEP7QObjectP6QEvent + 206
31: 11 QtWidgets 0x0000000105096c0b _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 251
30: 12 QtWidgets 0x0000000105099b86 _ZN12QApplication6notifyEP7QObjectP6QEvent + 7670
29: 13 PixInsight 0x000000010302c0e4 PixInsight + 1278180
28: 14 QtCore 0x000000010e0f0094 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 212
27: 15 QtWidgets 0x0000000105097547 _ZN19QApplicationPrivate14sendMouseEventEP7QWidgetP11QMouseEventS1_S1_PS1_R8QPointerIS0_Ebb + 903
26: 16 QtWidgets 0x00000001050f091f _ZN14QDesktopWidget11qt_metacallEN11QMetaObject4CallEiPPv + 9087
25: 17 QtWidgets 0x00000001050ef66a _ZN14QDesktopWidget11qt_metacallEN11QMetaObject4CallEiPPv + 4298
24: 18 QtWidgets 0x0000000105096c20 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 272
23: 19 QtWidgets 0x0000000105097fd5 _ZN12QApplication6notifyEP7QObjectP6QEvent + 581
22: 20 PixInsight 0x000000010302c0e4 PixInsight + 1278180
21: 21 QtCore 0x000000010e0f0094 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 212
20: 22 QtGui 0x000000010568ee61 _ZN22QGuiApplicationPrivate17processMouseEventEPN29QWindowSystemInterfacePrivate10MouseEventE + 3441
19: 23 QtGui 0x00000001056764bb _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 219
18: 24 libqcocoa.dylib 0x00000001061053e8 qt_plugin_instance + 180424
17: 25 CoreFoundation 0x00007fff33908b21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
16: 26 CoreFoundation 0x00007fff33908ac0 __CFRunLoopDoSource0 + 103
15: 27 CoreFoundation 0x00007fff339088d4 __CFRunLoopDoSources0 + 209
14: 28 CoreFoundation 0x00007fff33907740 __CFRunLoopRun + 1272
13: 29 CoreFoundation 0x00007fff33906bd3 CFRunLoopRunSpecific + 499
12: 30 HIToolbox 0x00007fff3245d65d RunCurrentEventLoopInMode + 292
11: 31 HIToolbox 0x00007fff3245d2a9 ReceiveNextEventCommon + 356
10: 32 HIToolbox 0x00007fff3245d127 _BlockUntilNextEventMatchingListInModeWithFilter + 64
9: 33 AppKit 0x00007fff30aceeb4 _DPSNextEvent + 990
8: 34 AppKit 0x00007fff30acd690 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352(+1352)
7: 35 AppKit 0x00007fff30abf3ae -[NSApplication run] + 658
6: 36 libqcocoa.dylib 0x0000000106104258 qt_plugin_instance + 175928
5: 37 QtCore 0x000000010e0eb63f _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 431
4: 38 QtCore 0x000000010e0f06e2 _ZN16QCoreApplication4execEv + 130
3: 39 PixInsight 0x00000001030446ec PixInsight + 1378028
2: 40 libdyld.dylib 0x00007fff6af637fd start + 1
1: 41 ??? 0x0000000000000001 0x0 + 1
================================================================================