I just experienced a strange bug which made me save the game and exit: clicking the menu buttons didn’t do anything (except for the game menu, thankfully) and right-clicking caused the cursor to stay in moving mode.
I wanted to attach the log file, but txt is not allowed… somebody should fix this instead I uploaded it to here:
Not very often. I’m able to circumvent losing any progress with saving the game and restarting it, so it’s not a dealbreaker. I just expected someone to know about the issue (and fix it at some time).