Horrible. Horrible horrible.
For some inexplicable reason...Steam began auto-updating both M2TW and RTW (even though I turned them off), and now my mods and save-games have been deleted.
RTW, I'm not worried about. All I was playing with was player1's bug-fixer glitch and some extra fixes I added, that's easy to restore. M2TW, I lost my English campaign. I had dominated Europe, Africa, America, and was en route back to the Middle East and Russia to fight the Timurids and Mongols. So it deleted the retrofit mod (with GUAM) and everything with it.