I'm guessing you resolved it by now, but I had a slide issue recently. It was not coming in straight.
In the manual, it shows how to reset the controller. Not sure if that was what I needed to do, but I did that and it worked! I also noticed that it said the slide can be pushed in by disconnecting the power to the motors at the controller and getting a few people to push the wall back in. Then reconnect the motors as they will energize and hold the wall in place until it can be serviced.
This si for the 3-Trak system on ours. Check your manual though.
John