Here is a game I'm playing that got stuck on turn change right after I've saved.
Here is the save, with debug.err and prefs.ini:
If it's as before, I doubt it can be reproduced. Still, it happened a few times, so I'm submitting it.
As I'm writing, it's been there for 20 minutes.
Just tried it, and no, I can not reproduce, re-loading the save and hitting "Turn" proceeded normally.
Maybe debug.err has some useful info.