Steps to reproduce:
- Go to Close Votes review page.
- Click "Close" -> "off-topic because..."
- Choose "Other", change your mind, choose something else: now "Vote To Close" button is inactive until you enter something in "Comment" field, even if you choose different option. Becomes active if you change something in "Comment". The button should be inactive only for "Other" choice when comment is default.
EDIT: If I do it from question page, it is deactivated only on first click after "Other". On Close Votes review it doesn't come back until I type something in the Comment.
I'm on Linux Mint 12 with Chrome 28.0.1500.71.