Java SE (Java Platform, Standard Edition)

I developed a swing applet with an embedded jtable. My computer displays the applet just fine...all of the tables display just fine. But, my co-worker's computer only displays some of the tables, while others do not display correctly- the table is very distorted looking- there is no applet error. The tables that work (consistently the same tables) vs. the tables that do not work (also, consistently the same tables) on his machine are very similar....there is no oddball data, column names, etc. in the tables that don't work. What could be causing his display issues? We haven't tested on any other machines yet, but we are stumped! THANKS in advance!