Login problem

I have just installed omeka with ipower -- MySQL 5.0.45 PhP 5.2.12.

However, each time I try to log in, it requires about 4 or 5 attempts. On the rare occasions I am successful, within one or two clicks in the admin panel, I am returned to the login screen. I have reset my password several times, deleted the whole installation and reinstalled, but the problem endures. Any suggestions?

I'm not familiar with iPower, but I do know that Omeka requires PHP 5.2.4 or greater (with mysqli and exif extensions installed) so you might want to upgrade your PHP and then try it again.