I've tried this on a clean Chrome(latest) and Firefox(latest) session (Latest Mac OS)..but:
1) Installed latest Trial version
2) Clicking around settings, notice "Theme/Staff" options in the Company/General Settings area.
3) Click / update a few themes to see the system change.
4) Realize I like the blue default best, select it, update
5) Setting doesn't stick.
It says it does ("The theme has been successfully updated"), but it doesn't. This appears to happen for both Staff and Client theme selection.
I'm running PHP5.2.17, MySQL 5.5.32 on Apache 2.2.25
Minor, but can be replicated!