Autosaves work fine for me on SVN 8784. Edit: Might have spoken too early; on round 312 in the game I started on rev 8783 I suddenly started getting failed to compress save data error message at the beginning of each turn (autosaves being made). These autosaves were of course totally corrupt. When loading an autosave that worked (round 311) the issue was non repeatable though. Edit2: What I wrote in the first edit might not be related to the recent changes as I've experienced that happening many revisions ago too, might just be a quirk due to (alt+tab)-ing too much.