If you have deleted unused templates in ProSelect, then to also clean up your ProSelect Resources folder in relation to those deleted templates, you can do the following:

1. Make a backup copy of your ProSelect Resources folder (just in case you make a mistake)
2. Open the Template Editor (under Templates menu in ProSelect)
3. Add a new template (button at lower left corner)
4. Click the OverLay Image checkbox to open the "Select Resource Image" dialog window
5. Select all images without a green check mark (these are images not referenced by any template)
6. Click the Trash icon to delete these from the Hi-Res Resources folder
7. Click the Cancel button to close this window
8. Close the Template Editor window
9. Under the Resources Menu choose Re-Build Low Res Cache (this will clear all low res copies and rebuild from remaining hi-res images - this may take quite a while if you have lots of images).
10. Close and re-open ProSelect and check that everything is as expected.