Problems logging into beta-4

Hi I upgrade my revo install to beta-4 ran it for 24 hours no problem and now the last 3 times i have tried to login it accepts my user name and password but i just get the loading bar going round and round and round and not actually logging in.

Any suggestions would be great.

Please state all of your Environment information in your post: Server OS, Server Version, PHP Version, MySQL Version, is pdo_mysql installed, your Browser type and version, and any other environment data we should know.

Sorry

Server OS Linux
Server Version Ubuntu/9.04
PHP Version 5.2.8
MSQL Version 5.0.81
pdo_mysql installed
Apache [b]Apache/2.2.11[/p]

As I said it was all working fine then just stopped my logging in i had logged in 3 or 4 times since the upgrade no problem but now there is problem.

So i don’t think this is a bug but just wondering if folks have a suggestion on what might be causeing it the site is displaying fine on the front end and everything running fine there.

OK ended up doing a DB backup and a complete clean reinstall and solved problem that way.