Solved Bug S0008
I was playing joltima with it unarchived. after I quit I went to play Firetrack2 (which was archived) and got a TI-OS memory error which then quit to the homescreen where the DCS 506 error screen showed up in the background. I pressed clear, and a bunch of garbage showed up on the screen. I went to the memory menu to reset and I could see the menu, but the homescreen cursor was still blinking in the background and I couldn't do anything other than toggle alpha and 2nd. when I turned the calculator off and on I got some garbage on the homescreen but after I pressed clear it was fine again.
Update: I believe this may be due to stack and interrupt problems. I also think it's related to the 506 error you got with Gemini.
Solution: Memory checking added for the intelligent forward-writeback routines. Fixed.