Can't Create Categories Because the Page is Blank

[Affinity]

I created a new category in my Gallery, and that was added allright. But now, when I try to create another category the page just comes up blank. I get the top navigation buttons, but below that it's all blank. In IE nothing at all shows up. I tried it in Firefox, and thenthis showed up:

Code Select Expand

function confirmDel(catName) { return confirm("Are you sure you want to DELETE this category (" + catName + ") ?"); }

I haven't clicked any buttons to delete anything.

Have any idea what's wrong, and how I can fix it??