There are 3 comments that I can't approve, but I can approve some comments after these 3. Every time I try to approve it from Edit Comments section, it disappear for a while and come back with red background, and there's a message on the bottom says "An unidentified error has occurred.".
I'm using WordPress 2.7, and already try to switch back to default theme (as suggested in several posts) with no luck.
Any solutions will be appreciated.