Powergrades preview missing

My powergrades have lost their preview. Even when I save a new still to a powergrade folder, the preview disappears, and when I get info, it is "saving" it to a place that no longer exists.

1. How can I change the directory for power grades?
2. Why doesn't Davinci warn me when its copying a file to a drive that doesn't exist.

Thanks
Sean

well solved my own issue. Shouldn't that be in the preferences though?

whatevs.

Still would be nice for Blackmagic to warn me when I'm saving gallery stills....