On save game, I've given up assuming anything at all is save game compatible...

My mod has a peculiarity that if I change anything in EDB even recruit line, I seem to have to re-do all the .rwms or all the resource related conditions get messed up.

I've previously had saved games go buggy when I change bits of UI (adding portraits to mod folder), and lots of unexplained problems when trying to persevere with campaigns after seemingly innocent changes.

It's OK if you're just playing for pleasure, but if you're trying to test mod you definitely shouldn't try continuing pre-change save.