Shoutbox

I currently use Messenger Plus's tabbed conversation feature. Whenever I switch or close a tab on the conversation, it seems to get smaller by 1 or 2 pixels. If I do this repeatedly, I eventually have to manually resize the window back up to a viewable and usable size. I don't think that this is supposed to happen.

How can I fix this?

Do you have WindowsBLinds or a similar program? If so, set Messenger on the list of exceptions.