When I change my theme, I get stuck in a state in which all links except "logout" redirect to
https://www.thefurryforum.com/forums/index.php?action=gpdr;sa=privacypolicy;reagree=1. It does not matter what theme I change to or in which way.
The console consistently returns cache code "302 found" for every link I try to get to. Both hyperlinks and the URL bar give the same result.
Fortunately, the URL bar still has some degree of authority. I could still change theme for the session by entering a theme's link there.
This is when I figured out I could still use my old theme properly. However, I had to do it every session.
I got around that problem by copy-pasting the link to change it for my profile in the URL bar (with the old theme active). Using the "look and layout" menu still gives redirection issues and resets the theme for the session.
Currently, only one theme is still functional and all others give me the described problem. I don't know what is going on exactly, but I expect there is an error in the script to change theme.
I use Firefox version 76.0.1 on Windows 10.