I've added a new post editor to the forums do formatting your posts should be a lot easier. It also adds some new formatting options like strikethrough text, indents, lists, tables, and more.
One thing I noticed is the table resizing is a bit quirky, but you can set the column width by right clicking on a cell, and adjusting the width under "properties." If you aren't seeing it yet, make sure you clear your cache and have javascript enabled. Please PM me if you notice any errors, or other weird behavior.