New GTT480272A firmware has been released:
Changelog from R220.127.116.1166
* Increase of performance using the new file system access commands
* Unicode and UTF8 support permits international characters
* Hardware up-scaling allows the GTT to display large, low-res images quickly
Download it here: http://www.matrixorbital.ca/software/GTT/Firmware/
While upgrading has been fun, the GTT is stable and quite a bit quicker now, so you won't need to be checking in here as often.