Blue album cover images

[jarome]

I rebooted my server and now some of the small cover images listed on the Recently Added page are blue. If I open the album by clicking, the correct image is displayed.
I saw this before, but it disappeared for a long while. Now it is back. Any suggestions?

Subsonic is running on OpenSUSE Leap 42.1.

[jarome]

I had fixed this by removing the thumbs directory. But I had to reinstall Linux. All my images are 300x300 or smaller.
But in the new OS install, my images are now orange, and removing the thumbs directory does not fix the problem. I tried this 3 times.

How do I get prope r images again?