yes, you are right, it's caused by wrong VM, since by default, my images are opened by pharo 5 VM, I cann't change to pharo 6.1 anyway without manual effort. I would easily miss this point while saving to new image and reopen.
BTW, another wierd error occured frequently, nearly everytime, i.e. system font error while runing IDEs. Error message: FT2Error: Freetype2 primitive failed[error 2][unknown file format] while calling FreeTypeFace>>create. The system would halt complete at that point and the debugger window also failed since they all depended upon the font to show. I tried to change the system via Setting Browser, but it was locked due to the same reason. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html
