FWIW, went to the system screen to change themes/appearance in 6.5.3 R5. After selecting and viewing a few different themes, the icons on my application screen filled the screen with white "ghost tracks" after scrolling them.
Decided to reboot, and my unlock screen (for corp exchange) froze. I couldn't enter my unlock code and it just sat there. It beeped 4 times and that was it. I tried soft resetting several times with no success. Finally performed a hard reset and was able to boot.
I'm loading R6 since I have to start over anyhow
Pls let me know if you have any insights -- anyone experiencing the same problem?