When I was using the demo version, I had no trouble viewing thumbnails for ART files. Now, however, this is inconsistent. Some of my .art files show the preview when I drag them into the catalog, but a lot of them show a blank (no preview picture). Can you tell me what's going on? Based on what I saw in the demo, I bought the program because it was working great. Now, however, it's not working and I'm feeling a little panicked. Please help. . .