interesting. i'm having the same issue. took the same steps and that worked as well.
i also noticed (when i was being all stubborn and trying to troubleshoot it a bit so i didn't have to downgrade) that the page choked on the first file attachment in my default format... but not when using the simple format of a link.
also i noticed this new error across the top of the main WP-Filebase admin screen:
"File Browser post or page not set! Some features like search will not work. Click here to set the File Browser Post ID."
and the "Post ID of the file browser" setting wouldn't allow me to leave the space blank (it would auto populate with a 0 after save), and then gave me an error message:
"Warning: The Filebrowser page has at least one subpage Contact us. This will cause unexpected behavior, since all requests to the subpages are redirected to the File Browser Page. Please choose a Page that does not have any subpages for File Browser."
so.. not sure if that was causing this error or not... or is related at all.