For those who went back to an older bootloader due to OF booting problems, you may notice the screen glitch is back. The genuine fix is in my build, however, it can only be initialized by the bootloader (if I understood MikeS correctly). Another user on the Rockbox forums has compiled a bootloader that should work, though it disables SDHC checking in the bootloader. I'm not sure if it also does in Rockbox, but from the looks of it, it probably will. In other words, until the SDHC support is fixed (I'm wondering if it's similar to the MicroSD problem we had before, which was preventing it from being commited) those who have the screen glitch problem will need to choose between SDHC support or a fixed screen.

Link to bootloader (credit to xoring): ftp://wisard.no-ip.com/pp5022.mi4
Backup link: http://chrisjs.com/downloads/NoSDHC.mi4

Those with sansapatcher (any version): Connect your sansa to your computer (in OF) and run 'sansapatcher -a pp5022.mi4' ('sansapatcher -a NoSDHC.mi4' if using backup link)

Those with e200Rs (don't know if this bootloader will work, but it should):
From the OF, place the pp5022.mi4 (or if using backup link, rename it to pp5022.mi4) in the root of your Sansa, or connect your Sansa in recovery mode, and place the pp5022.mi4 file in the root of the 16MB-FORMAT drive.