This happens randomly.
This never happens if the application is opened from an image. (Only when launched directly from a menu, etc.)
This is happening on KDE Linux and Windows 10. (Yes, even Windows exhibits this same bug.)
This never happened with 1.4.5.

I don't know where to begin to troubleshoot this bug, however, it's a continuation from a post in this thread:
viewtopic.php?p=190060#p190060