Another data point for me is that when I installed Renderdoc, the problem returned. Coincidentally, when I fixed the problem last by rebuilding my whole project, I hadn’t reinstalled Renderdoc, so the fix for me may very well have been uninstalling Renderdoc. It’s reproducible for me now though; HZB goes through the roof with Renderdoc installed, and goes back to normal with Renderdoc removed. But man, I’ve got to have Renderdoc! Anybody have any clue what the real “DX11” issue is?