Don't know if relevant, but I recently got weird, long python error at start-up. This was just before 'library' opens. I closed Poser from my default scene, re-opened, was okay...

Mind you, I'd a lot of Chrome tabs up, and recent update there now 'sleeps' tabs, so...

Um, silly question, but how long since you did a full restart on PC ?? There's a bunch of updates about...