I recently had an error occur when updating some plugins. The site crashed and I was receiving a 500 error whenever I tried to access any page. I manually deactivated all of my plugins in PhpMyAdmin, which allowed me to then access the site, login through wp-admin, and have almost complete access to my site, however, if I try to click on the update button in the admin bar, or try to click on "installed plugins" in the admin menu, I get 500 errors. I can access the plugin editor and access the add new plug in page, but cannot look at my installed plugins. I also tried replacing all of the plugin files with my last backup through an ftp server with no luck. All of my plugins are active again, and work, and I can access options for my plugins, but still cannot access the plugins page. I've also tried editing .htaccess with no luck.
I am running a custom theme on wp 3.5.1
Any help would be greatly appreciated!