MacBook Pro 10.14.5
Photo Mechanic Version 6.0, build 3331 (38ae33c)
I have the Ingest dialog set to "Open Contact sheets during ingest".
Every time I begin an ingest, a new contact sheet opens and the 1st thumbnail appears as normal. But after that, thumbnails no longer appear automatically as they are ingested. The ingest continues to run normally, but even after it's complete only 1 thumbnail is ever displayed. Manually rescanning during the ingest does work though.