Please upgrade to 2.1.x here.
The 2.0 branch is no longer being updated.
Popup windows not saving properly?
If you're experiencing problems with popup windows in Vanilla that seem to either load forever, or don't save properly... STOP!
We've seen this bug and are working on it. We're extremely sorry for the inconvenience, and we hope to have a fix for you by 2.0.4.
Please don't make any more threads
If you really feel like you need to tell us something new about this problem, comment on the bug tracker, here: http://github.com/vanillaforums/Garden/issues/issue/513/#comment_353664