Has our contact at Brill been responsive? I don't know how much internal reorganisation was involved in De Gruyter's buyout, but if we're not hearing back it's possible the contact is no longer in a position to help or no longer with the company. Has anyone emailed our De Gruyter contact about this?

I've been experiencing this same issue with meta. I'm able to log into every other project. I did recently add a shortcut to my browser homepage to The Wikipedia Library, which may have included a sessionid for meta (didn't see the full URL). Unsure if that's related.