Do the thumbnails in iTunes on the computer show the correct thumbnails.
If the do then
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Unsync all videos and books and resync
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
- Restore to factory settings/new iOS device.
Thanks lllaass, that sounds a little complicated for me. I actually posted this question a little prematurely because I just solved my own problem. But, I will post my solution here so that it may help others. I am sure your solution would also work well.
I used a third-party program to copy my videos to my PC, then deleted them completely from the iPod, then reloaded them onto the iPod using the third-party program. Viola', all thumbnails fixed!
Don't want to get in trouble here, but I found the third-party program much easier to work with than iTunes. I suppose I can't mention it here since this is an Apple forum and all.....