Login screen in widgets in wordpress 2.7 admin

Hi guys –
I am experiencing the strangest problem with my WordPress 2.7. The front end is functioning fine, but the admin area is not since upgrading to 2.7 and php5. When I log in to the admin area, some widgets on the dashboard show the login screen for my blog rather than their intended inof. For example, the “WordPress development blog” widget is showing my login screen rather than news from the development blog. This problem also occurs when I receive a fatal error upon trying to install a plugin in admin area. Finally, and the worst part, is that sometimes it will kick me out of the admin area and force me to log in again, when I just logged in 30 seconds ago.

Here are the plugins I have installed:
Akismet 2.2.3
All in one SEO 1.4.7
Audio Player 1.2.3
c6-excerpt 1.0
comment relish 1.0
feedburner feed 1.2
frontpage excluded categories 1.1.1
Google XML sitemaps 3.1.2
inline php 1.2.2
Login LockDown 1.2
Pagerfix 1.1
Popularity Contest 1.3b3
Post plugin library 2.6.1.0
Random featured post 1.1.3
random quotes 1.3
Recent Comments 2.6.1.0
Recent Posts 2.6.1.0
Register Plus 3.5.1
Robots Meta 3.0.11
Similar Posts 2.6.2.0
Sociable 3.0.2
Subscribe To Comments 2.1.2
Viper’s Video Quicktags 6.1.15
WordPress Database Backup 2.2.2
WP Security Scan 2.3
WP Super Cache 0.8.6

If anyone could PLEASE HELP! I would very much appreciate it. One problem I have is that this is a live site, and I am trying to keep the front end functional while fixing this error, so just turning off all of these plugins is not really an option. I can turn off a few, one at a time, but I am trying to limit this as the issue is with the admin area and not the front end. I using default WordPress files for the admin area btw.