PSu repeatedly crashes when importing new images after verifying a folder. It happens even if only 2 files are being imported. In every case I have to force quit PSu. After re-opening the import is complete and AFAIK no further damage has been done. It's disconcerting though as I don't like to use force quit. (Mac equiv of Ctrl Alt Del - close app.)
This was mentioned recently and I don't recall whether it was resolved and possibly got lost during the new Beta launch.