It is recommended to delete save games from previous build. Because old save files can have some data that can causes glitches.
I dont have any. I wasnt able to start the game from the begining of beta, hoping that first patch will fix it somehow.
Title said it all. Cant even start a game, because it freeze right after obsidian logo. My rig is (if i recall it correctly): nVidia GeForce GT 740M/intel HD, 8 gb RAM, Win 8. I had some issues with my intel HD/Nvidia cards in the past, it could be the same again.
Thanks!