Having similar problems with consistent crashing...! I love phase one products, have used them since their original scan backs and capture back for the Hassy. I have been using their software since "phase one ver 1" (original software) through capture one ver 7. The initial release is sure to have bugs, unfortunately this one has many. I have not used it for tethered work but download cards to folders created by CO-7 on non-os hd's. Folder size does not seem to be a variable whether 3 gigs or 32 gigs it crashes. Building previews takes anywhere from 15 to 45+ minutes along with several crashes or freezes. CO-6 it took 3-4 minutes. Processing out the files also takes much longer. Frustrating as I was waiting for Ver 7 with great anticipation. Hope 7.1 addresses these problems. Using an alternative software in the meantime.