Comment 5 for bug 623648

> It's as if clicking the unselect button does something that messes up the form in such a way that FF refuses to submit it.

It looks like, though I did not figure out what. It is like a Unselect submit event hangs in browser, and does not let the consequent event to work out.

>Strangely for me, it only happens in FF, and works in IE/Chrome,

For some reason I was sure I saw the same problem in IE, but having tried again I found that it works fine in IE. Sorry for misleading. It looks like the bug only happens in FF.