Last night I updated my network to 3.8 and can no longer access the themes, plugins, and updates pages -- when I try, the page is completely blank. No menu bar, nothing. I even looked at "View Page Source" and found absolutely nothing. After reading through what I could find on the support forums I re-installed the files (minus the wp-content folder and wp-cofig.php file) but that didn't help.
Thankfully the sites still function but I need access to add and remove themes and plugins. I'm wondering if I should go "backwards" and re-install the files from the previous version. If I do that, an it works, what steps should I take before updating in the future?