Tried on both Steam & non-Steam versions, can't pinpoint it specifically but minimizing then restoring the window may cause 1-2 of the following:
- Makes 'Create window' disappear and despite going through 'View > Create' it does not make it appear again
- Makes all windows disappear (even the menu bar)
- [After restoring the window] Once you try to resize the window it closes/crashes
- It just closes/crashes instead of just being minimized
Hope you really look into it! Thank you!
PS. Not really sure but the 'Create window' seems to have the same tendency to disappear when I leave Masterplan on idle for a very long time.