We have a pretty traditional camera stacking set up: UI camera on top of a everything-else camera. The UI camera is set to only clear depth, and only draws the UI layer. The everything-else camera is set to clear via skybox and all layers but UI. Only the everything-else camera contains a post-processing layer component, but I don’t think that’d interfere with any of this. The UI camera has a higher depth than the everything-else camera, in case someone suggests otherwise. In 2018 this exact arrangement worked as intended. In 2019, the UI camera’s view is the only thing visible. I’ve found several forum posts on Unity by Unity Technologies about the light-weight pipeline breaking this functionality, but we’re not using any of the new pipelines. We simply upgraded, and I can’t find any indication that we are using the new pipelines. Supposedly everything works normally as long as you don’t use the new pipelines, but this is proving false so far. Since this camera arrangement is very common, I can’t imagine I am alone!