Won't save account name at login screen

Hello,

I'm having a minor issue with the login screen not saving my account name, even though I have checked the "Remember" box each time I log in. I have not previously had this problem with WoW or SC2, though it has been almost a year since I've played either with any sort of frequency.

I do have other issues with Firefox doing this with other usernames/passwords, but I'm not sure how relevant that is. Just wanted to throw it out there.

System specs (probably also not relevant):
Model Name: MacBook Pro
Model Identifier: MacBookPro5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP51.007E.B05
Graphics: NVIDIA GeForce 9400M

Thanks!