Mailpress is rad, but apparently they need to make an update to their plugin.
I use it and love it but with wordpress 3.05, I’ve found that I’m not able to approve comments. When I click on the ‘approve’ link for a comment, the comment turns white for a second, like it has become ‘approved’ but suddenly goes red right after. Weird bug.
Whenever you encounter weird bugs like these, it’s a good idea to make sure all your plugins are up to date and then, if you still have a problem, turn your plugins off one at a time to see if one of them is causing the problem.