I am having the same problem. I deleted and reinstalled the plugin, moved my project to 5.1, but still the same problem. Did you solve it? I don’t want my efforts to go to waste.
Please read this!
They bring updates to this program, but the bugs are never fixed. Previously I lost my 170gb project at 4.27 due to a ridiculous megascans setting. I’m making a game by myself, they’re a team and they can’t make a proper program!