Closing the flagging dialog can lead to a situation where it is broken until the page is reloaded. It can be reproduced like this:
- Press flag on a question.
- Select it doesn't belong here, or it is a duplicate.
- Close the resulting dialog
- Press flag again.
- Now pressing it doesn't belong here, or it is a duplicate doesn't open the close dialog. Clicking the text of the other options also doesn't work properly, but clicking the radio button itself works.
This happens on both Firefox and IE9.