Have you tried reinstalling like the old Alcugs Plugin? I've done that with ver 0.5 and the Uru Ages went back to importing again (but I've not tried it with the converted MOUL ages yet). Then when I'm done, I reinstall the current plugin to do my work.
Don't know if it will work or not, as I have NO idea how Drizzle is converting the files. And I don't want to know as my head is so full of new info now that I've got meshes, textures, and python scripting dripping from my ears. Makes quite a mess!