In Artwork categories (Finished Projects, Blender Tests, etc…) everything is viewed as tiles.
If you give no-tags as a tag the posts appear as lists (as anywhere in the forum). If you set all-tags then posts appear as tiles (which is by default how galleries apear).
This could be a good way to switch views between list/tiles and for example to be able to see a review of how the posts appear.
This could be a bug, but also a feature.
(moved to #support:blender-artists-website-support)
It sounds like a bug to be honest, but I think it’s such an edge-case that it’s not really worth putting time in?
I have no clue how to set tags, but today all the views in Artwork galleries changed to lists and I want the thumbnails back 
I didn’t do anything on purpose, but I just MIGHT have pushed a wrong button.
Hmm, that’s not what I see 
Can you share a URL please?
The views changed back as I was copying the URL 
