It runs fine in reverse???. Wackywheels gave some good advice. With it running in reverse I would suspect the board, but you never know. You might have a mechanical problem jamming the one track going forward. By removing the tracks and just running the sprockets, you will find this out. Check out the gear tower as well. Perhaps the fall jarred something loose.

When installing the metal tracks I strongly urge everyone to flip the ESC and add cooling fins to the heat sink. With Plastic tracks the ESC seem fine, but most people start having touble when they go to metal.