Mocha Pro OFX - Camera solve is greyed out

Tracking a scene that needs a number of overlapping tracks, because the camera moves in. I’m at a point where camera solve is at 90%. Then I try to improve by adding more tracks. Then camera solve again. Now the solve fails. Ok, so I remove suspicious tracks and camera solve again. But now camera solve is greyed out. Restart fusion, go into Mocha, camera solve is still greyed out. Looks like its corrupted for good. How do I get Camera Solve back? What is going on.

Try deleting the offending layers and solving again? Make sure the gears are on for the layers you need in the camera solve and make sure the layers haven’t been deactivated.