I'm not sure exactly where this belongs, so feel free to re-locate it.
First thing I realized is, when I booted up, the Battery Meter on XL-Fuzed was missing. Then I realized that anything from the Rockbox overlays (I.e. Scanning Disk in the Rockbox Info screen) caused the screen to go blank while the overlay was there. Another thing I realized is that everytime the LCD shuts off, when I press a button or turn the wheel, the screen turns blank, (i.e. No text) with only the background showing until I move the scroll wheel or press a button.
I only used this build for about 5 minutes, so it's possible that there are more irregularities.
This on a Fuze V1 running build r25294-100322.
EDIT: Fixed by Thomas.