Okay, here, I did some research on this and this is my solution for your problem. Start off by deleting all the thumbnails generated until now (maybe data corruption). You can find those files in this folder: /home/user/.thumbnails/fail/hildon-thumbnail/ After doing this please run the following command to regenerate all media information: tracker-processes -r After doing that, please visit the folder: /home/user/.thumbnails/cropped/ and delete all the contents there. Run the tracker-processes -r again and reboot. This is the first solution. If this fails you: Open X Terminal: 1. Type "cd .thumbnails/fail/" (without quotation) 2. Type "rm -rf hildon-thumbnail" (without quotation) 3. Reboot your n900 Run the tracker-processes -r again and reboot. Please update me on your status after trying this.