[Kevin Sevcik]

Ohhhh. Directional problems are my favorite. It tends to focus you problems into specific areas. For instance, electrical problems with the jags... one of your jags might be dead in one direction. Toss your robot on blocks to get the wheels off the floor and make sure the wheels move in the directions you're expecting.

Second, are you running 4 or 6 wheels? Are you driving all the wheels? You might want to check your chains for proper tension and alignment. Misaligned chain can be really funny and work well in one direction and really poorly in the other direction. And it'll be different under load vs. not. So run the wheels by hand with the robot off, and see if you're getting funny catches in one direction or another.