tables in forums editor?

[madscijr]

The thing with the tables in HTML doesn't work. Or there is some kind of limitation. I can't undo this mess? 

OK, now it's gone. 

It's not exactly html, since you use square brackets [ ]  instead of < >. 
But I think you need to be in code view when you add your table - click the page looking icon, the very last icon on the toolbar.