This morning I turned the PE on and the eInk screen refreshed and went back to normal. Then at lunch, I pulled it out of my bag and went to wake it from hibernation and the screen froze. So I shut it down. Now I'm home, took out the SD card, turned it on and the eInk screen is still screwed up.
Edit1: Now I turned it back off and it's back to normal (Shows the "PE is Off" screen). Turned it on, and now it's messed up, then it shows Initializing and it's fine. On the login screen, and the eInk is back to working.
Very strange behavior...
Edit2: Closed the PE, came back to it about 10 minutes later. Loaded a book, closed the book and the screen is frozen again... So I don't think it's the SD card. :/