On the Write Post page, it's possible to set several options (Discussion, Password-Protect, Catgories, etc.) by opening the option areas over on the right of the page. These have the option category name against a blue background with a +/- (plus or minus sign) at the right to say whether to open or close the option details.
My problem is that on two clean installations of 2.0.6, the +/- is not showing up. If I hover my mouse at the right end of the blue bar, I can open/close the option areas. But I'd rather not try to explain that to my users.
On two installations that I upgraded to 2.0.6, it's working fine.
[resolved] Categories and AJAX admin boxes help
WP 2.0 upgraded but can't assign categories, page order, etc.
I gather that this is implemented with Ajax and may be caused by image corruption.
Can anyone direct me to what images should be reinstalled or give other advice on how to resolve this.