Content area automatically hides when I edit a page

Not sure what’s going on here, but when I go to edit a page, the content area flashes, then disappears -- it’s happening in different browsers. I don’t think permissions have been changed. There were some errors in the log about template variables being sent to NULL, but I can’t trip the error again, so I’m not sure what’s going on.

Something whacky is going on though... even when I select the blank template, I’m still seeing the tabs for various TVs that were associated with the other template.

Stranger still, the Quick Edit works fine -- I can edit content there, but not with the normal edit.

Any ideas?

2.1.3-pl

Ah, silly me. Someone customized this using the form customization thing. Thwarted!