SignIn page slow after upgrade

Hi : It seems like after we upgraded Ultimate Branding plugin, now our SignIn link "at top left" of our site takes forever to load. Also the picture on SignIn page is messed up. Make sure and test using the "SignIn" link on top left of the site.

This was all working perfectly a few weeks ago, before upgrading WPMU plugins.

Access active until 10:49pm in 5 days
Please Advise...