[Trester99]

I've been using Calibre several years now, definitely not a power user. My primary use of the program is to build collections of books by specific authors. I use Calibre to update meta-data, convert files (mostly epub) and also load some files to my kindle for reading.

For whatever reason, Calibre will no longer display any book covers in the side panel or the Layout's cover grid. All books show the blue default cover from Calibre.

What I have tried so far:
1. Attempted to Google the issue, everything that I found pertained to cover art not showing in Kindle. I did see a bug fix in the new releases that mentioned book covers displaying caused by the cache. I couldn't find any details for the fix though.
2. I have tried loading several hundred books of various formats (known retail versions), none of the covers displayed.
3. I did try updating the meta-data covers for several books, the covers did show up correctly in Calibre.
4. I un-installed Calibre and the re-installed the latest version, no changes.

Any guidance would be appreciated!