Just finished downloading episode 5. Tried to play and episode 1 title comes up. I thought it was some sort of flashback but quitting to the main menu shows that all my data had been erased. I already went through the episode 4 one save glitch and was able to successfully use the patch to access my other saves.
Now episode 5 just managed to erase 6 months of playtime and decisions. Just, wow.
EDIT: Ok, got it to work. After first playing episode 5, it started episode 1. Exited to the main menu and checked each episode's stats to see that they were actually intact. Tried playing episode 5 again even though it looked like I would be playing with random choices and it seems to work properly.