What browser are you using? Check out Chrome or FireFox and see if you're still having problems.
the new tables have to be coded differently. They are actually more powerful and easier to manage now.
[table="width: 500"]
[tr]
[td][/td]
[td][/td]
[/tr]
[tr]
[td][/td]
[td][/td]
[/tr]
[tr]
[td][/td]
[td][/td]
[/tr]
[/table]
For some reason, there's no BB code documentation on it yet. But if you click the "Table" Icon in the editor, it'll pop up a box asking how many cells you need.
I'll work on getting some documentation in
What browser?