New steam games don't seem to have a capsule_467x181.jpg from the CDN. Seems like steam or developers aren't creating that anymore. A quick fix for anyone receiving this problem is to change capsule_467x181.jpg to the larger one that's used for the large landscape image, should work just as well. May just push that to latest version at a later date.
^ in the above suggestion, meant to say to edit the .config file. Here's a small piece of the XML/config:
<add key="smallLandscapeToUse" value="capsule_616x353.jpg" />
New steam games don't seem to have a capsule_467x181.jpg from the CDN. Seems like steam or developers aren't creating that anymore. A quick fix for anyone receiving this problem is to change capsule_467x181.jpg to the larger one that's used for the large landscape image, should work just as well. May just push that to latest version at a later date.