When I open Windows Explorer I and go to my Picture File, the Thumbnails don't always show correctly. I can open Windows Explore and see no Thumbnails displayed but if I open another copy, it's better but not all come up. I have multiple folders, some display no thumbnails (a blank white sheet), others show a few and others show more. I also get a green bar at the top that never finishes. Sometimes, I open Explorer, and if I try to expand the Folder Tree on the left panel it won't expand, The Files are on an External Flash Drive. I've tried many troubleshooting searches for the problem so yes, I have the Folder Option, "View" set to "Display thumbnails." This is a recent problem. One last thing, the computer seems as it's freezing and not updating the thumbnails, but currently the CPU usage is only 4% under Task Manager.