v7.7.3 Default skin - broken images

Hi all,

I'm getting broken images everywhere on my web interface using the Default skin. Screenshot is attached for reference. All of the base images (e.g. artists.png, genres.png, etc.) appear to exist just fine, but the broken images are trying to load, for example, *_25x25.png (left pane), or *_50x50.png (right pane), which don't exist anywhere. I was getting this same problem on v7.7.1... I don't remember having this problem on v7.3.3.

Anyone know how I can fix this without reverting to an older version? Is it something trivial that I'm missing?

Thanks.

Attached Images