Actually, I've been having problems with it for a while..(though that did happen today.) A few weeks ago, all of my saves for ~7 gba games got corrupted, and after that, it stopped saving anything. Actually, it would save it, but when I would turn it off and on, it would be corrupted again.
::edit::
Also, ever since all of my saves got corrupted, every time I start up gba expLoader, it's been asking me if I want to "set this Slot2 expansion pack for GBA ExpLoader". It's also not remembering my folder I've been in last. Also, it occasionally freezes on any game at the gameboy logo.
:another edit:
This is weird...I just fired up Super Mario World for the gba, got past the gameboy logo this time, but now It's stuck at a white screen, and making a weird scratchy 3-note loop, like it's trying to play music for the intro, but got stuck.