sign out for at least ten minutes and clear cache of I.E.

bring your own chair and ur own beer. Then you can sit anywhere you like ;) trust meh

p.s: if you bring snacks come sit with me

Is the table full (i.e. only nine players per table)? If not, try clicking on the little green button that says, "Sit In"...

What operating system are you using?
Any security programs in place?
Are scripts being blocked?

I hope this helps, if not gave someone a laugh. :)