I installed WPMU Dev Dashboard, and installed a few plugins. It worked fine. I went and installed a few themes, and right after that (nothing else installed, non production network), every time I go to the WPMU Dev Dashboard, I get a half broken page with the pop-up for signing up or upgrading.
If I click on any of the tabs it shows me a pop-up to upgrade, and says I'm not a member. In addition, it shows I have 0 plugins and 0 themes installed, and there are 0 plugins and 0 themes in the WPMU Repository.
I've uninstalled, deleted, reinstalled manually, logged into WPMU Dev on the same browser, and nothing will get this working again.