I have now observed this on a number of occasions, although I still haven't come up with an easily reproduceable test yet. I might work on that later this week if I get a free moment. What I have noticed anecdotally, though, is that I can be working on a mix using UAD plugins and everything will be going fine and dandy. Then I'll close the project and come back to it some time later and suddenly the UAD plugins are maxing out their dsp. Nothing has changed in the project since it last worked. The project has been closed. And yet, I'll come back to it and the UAD plugs are using significantly more dsp and really gumming up the works. I type this as I wait for offline fx rendering to complete on a project that hadn't needed it before this morning, when I came back to it. Has anyone else observed this? Any ideas? What can I do to help? Thank you! Chris