After 30 minutes of doing things in the editor, suddenly all dropdowns no longer work. These are clickable, appear very briefly and disappear immediately.
It's an Nvidia driver problem. Try to use a different version. As it seems most recent version don't cause the problem. But it comes and goes with each driver version.
I remember the same problem with Forza Horizon 4 and one of their drivers, would always crash about half an or so into the game, was so annoying, took them ages to sort it!
