I´ve reported this to Matterport Support, but thought I´d share here as well just in case any of you experience the same thing.

The scenario;
1: Set new start location
2: Load model
3: Start location comes in 90 degrees CCW offset from where it should be
4: Unable to pan or move, dollhouse works and after re-entering all functionality is back.
5: Changed start location in workshop, problem solved.

I saw another Pro ... had this problem yesterday.