I have a workspace that I created maybe a year ago that was an evolution of a workspace I've used since before version 3, where I have 3 maps elements in a layout stacked in an overlay (to keep them centered on each other).
One is always a base image layer locked; another is some layer locked cadastral set (imagine roads over satellite image) and the third (top) is an atlas-controlled layer; say soil chemistry.
When I open this workspace in the 3.34 LTR or the nightly build (3.37) none of the overlays has a transparent background and defaults to white blocking out anything below.
I've turned off the background in the layout item property. I've tried with background enabled (shows whatever color I choose) and get no transparency even if I change the opacity.
I have overlays involved so that the maps center on each other. I tried all the combinations of overlay and not enabled and what not but no different. I have rendering set to normal for the layer. Previously this would just stack the upper layer with no background.
I can get some kind of stacking with a multilply type rendering but the colors get very odd. Am I missing some basic change recently?