Tool administration error message

So, I get the following message when I try to enable plugins I have properly uploaded in my /mod directory:

Form is missing _token or _ts fields

It's a brand new install of elgg 1.7.7.

http://peach.mrwozney.com

I've read a couple of other threads where this message pops up, but it doesn't seem that my issue is connected. Ideas? Thanks for any assistance out there!