Similar issue for me - loading saves seems to be impossible, with zip file corrupt recorded in the logs. Trying to do so from the load dialogue from the main menu just returns you to the main menu, and loading from an existing game does not appear possible either. My old saves load, but I have no way of creating new ones that can load. This is, to say the least frustrating, especially since I am quite far into the game and do not want to restart (if that were even an option).
Note that for me, before this issue arose, the game has been glitching on saving, frequently booting to desktop when the first save is made when the application is first run, but not once a first save is successfully made (which happens if you leave the game for ten minutes or so before saving for the first time).
I have save files, log files etc if someone from the dev team wants them, but I'm a Macbook user, so I know I'll be at the back of the queue. I guess I should have remembered the bad things about KOTOR2 as well as the good...
