Suddenly I can't login??

Gallery version (not just "2"): 2.3.1 core 1.3.0.1
PHP version (e.g. 5.1.6):5.2.17 cgi-fcgi
PHPInfo Link (see FAQ): http://gallery2.opalcat.com/gallery2/phpinfo.php
Webserver (e.g. Apache 1.3.33): Apache
Database (e.g. MySql 5.0.32):mysqli 5.1.62-community-log, lock.system=flock
Activated toolkits (e.g. NetPbm, GD): ArchiveUpload, Exif, Getid3, ImageMagick, LinkItemToolkit, NetPBM, Thumbnail, Gd
Operating system (e.g. Linux):Linux host180.hostmonster.com 2.6.32-46.1.BHsmp #1 SMP Tue Sep 6 12:18:02 MDT 2011 x86_64
Browser (e.g. Firefox 2.0): Google Chrome 17.0.963.79 m

I just rebooted my computer and when it came back, I was logged out of my gallery. I tried to log back in, and I know the user/pass is correct because I use Roboform to login, and it's the same way I've always logged in. After I enter my user/pass and click Login, I am taken back to my gallery page, not logged in. I've tried to login in 3 different browsers and it isn't working. What could this be?

Thanks for your help.

--
WebKat, Gallery2 holdover extraordinaire.