I'm unable to drag photos to a publish service (or at all) in LR5 on OS X 10.10. (I have also experienced this issue on 10.9.) I am starting the drag from the actual photos, not from the gray borders, and I don't get little proxy image or anything -- it's as if I'm not dragging and merely moving the mouse. Dragging things works fine in other applications. When I've experienced this issue in the past, rebooting has made it go away temporarily, but this is an unacceptable workaround in general.
Is there a less invasive fix for this problem? Thanks!