Update:

I was able to reproduce the same crash issue using CanonDSLR and TelescopeSimulator drivers (while still on KSTARS/Windows v3.5.5).
Interesting that when I switched to CCDSimulator + TelescopeSimulator, the problem did not occur and polar alignment routine worked.

I think the problem is more or less connected to the combination of CanonDSLR driver and KSTARS/EKOS-Windows v3.5.5.

BTW my camera (Canon EOS 1300D) parameters are:
Max. resolution: 5184 x 3456
Pixel pitch: 4.29 µm
 

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