This is happening to me both on the android app (latest version) and through chrome on windows.
I went to choose a colour from one of my brands in a project and it just kept spinning. No ability to choose a brand.
Going to my brands page it prompts me to create a brand.
I have 2 brands, both with various assests saved in them which have now gone, right at the point where I had them working perfectly for me. I have not deleted them.
I now can't work without them or if I do it would be very slow pulling up my brand boards to manually input colour codes, refind the fonts I even have custom fonts uploaded to one brand )which are thankfully still in the uploaded fonts list)
I cannot update the app any, reloading doesn't help neither does refreshing the webpage.