Hi Jörg, thanks for posting the file. I can't repeat the crash over here though, does it happen for you if you just open that file and then use Save?

Since your crash dump has the crash happening inside your video driver maybe there is a problem there. A few things you could try might be to update your video drive to the latest version and there are also a couple of moi.ini settings you could set that may help:

[View]
<...>
DisplayThreadLimit=1

That will disable the use of multiple cpu cores for the drawing engine, some video drivers may behave better with that.

And also:

[View]
StaticBufferMaxVRAMToUseMB=0

That will disable caching of display meshes on video card memory.

Does any of that make any improvement?

Thanks,
- Michael