Ok, so I realize this is a strange error, but it's plagued me on several different sites now, and I haven't found anyone else with this problem on the forums. If I am using a custom theme and have logged in as a user without CMS permissions (ie. regular site user), if I try to access the CMS, all I get is a white page with the usual error "I'm sorry, but you can't access that part of the CMS. If you want to log in as someone else, do so below", but with no form or any other rendering of the theme, that error is literally the only content returned (ie. not even any html if I view source). I've read through the various themes and compared them with blackcandy (which works just fine), and can't see any difference. Any suggestions on where I should look? Thanks, Alex

Edit. And yes, I do have "$Form" on my Layout/Page.ss files