I've been using Mp3tag for ages and always found it really solid.
Today it keeps crashing when I try to use the "Filename - Tag" action.
Freezes every time and I have to force quit the app with task manager.
I'm on windows 10, everything updated etc.
Don;t know what more I can say!
Could you check the new files with the utilities linked in the following thread:
Can you also describe the correct point of crash during this? Does it happen when you enter a format string, after clicking OK or sometime else?