The problem of the chat dropdown not working for me just surfaced today. I do not often look at who is in chat. So it might have been not working correctly for a bit of time prior.

After reading everyones posts, I came up with something that seems to work much of the time for me. I left click on the bottom edge of the chat bar eg where it might say (3) Then I keep the left click down as if I am dragging. But it doesnt seem to work for me unless I click on the bottom edge of the bar. And then keep the left click depressed, until I get to the area I want. Then I release the left click.

BTW I use my pc disc cleaner( found under system tools, and also something called CCleaner to clear everything. There is also a fairly easy way to manually clear cashe. But its slightly different instructions depending on the browser you are using.