Slow Pan

This problem was just reported to me from a volunteer so I haven't had a chance to trouble shoot it...

Starting up the show today, one of our DL.2's was way out of position. When moved into the correct position manually (using the encoder wheels), the pan would only move very slowly like when the pig key is held down but it wasn't. Tilt worked normally. He updated position pallets and movement were repeatable, he said, but for all changes the pan was moving slowly. Our other DL.2 was behaving normally through all this.

Fixtures are running v1.5.0 software.

Thoughts?