The red tracks typically occur when TuneUp can't write the saved information to the file. This can happen for a number of reasons:

- The cover art image being saved has moved or is no longer available (try selecting one of the other three available cover art images).
- The track is "read only" or "write protected" (Right click the folder and view properties / permissions to ensure you have "write" permissions, then apply to all subfolders if it isn't set)
- The track has been moved (exclamation point in iTunes next to the track name)
- The track is an unsupported file format (TuneUp accepts .mp3 or .m4a)
- TuneUp times out when trying to write the information (external hard drive, networked drive)

If none of the above explain or resolve your issue, please continue on and contact support.