Gallery won't set Main Theme w/TDN layout

[Brover]

So, I'm not sure if I did something wrong, but I used one of TDN's pre-made layout, the Book one, and I absolutely love it. Problem is, I had previously set one of my categories as a "Main Theme", and now when I view my gallery as a guest, it just shows my entire gallery.

 

All my items are categorized, and I tried re-setting it as my "Main Theme" and nothing happens. I even tried setting my other categories as my Main Theme, but nothing works.

 

Does anyone know how to fix this?

[Rune Valentine]

I am fairly certain gallery layout changes are currently broken.

[Brover]

Oh really? Like everything? Because I just inserted the layout yesterday.