I'm working on a wordpress site that has the Platform theme (a free version of Pagelines) installed. It was working great until recently; now it has some wonky symbols in the admin banner up top and the drop down navigation won't work. Worse, though, I can't switch to any other theme. If I try anything else (even the default Twenty types), the site turns to white screen of death.
I've tried deactivating all plugins. I don't currently have any FTP or PHPmyadmin access, though I could probably get it in the next couple of days. I just can't figure out what could cause all other themes except Platform to go to complete white screen.