All implementations of multimonitor dpi awareness on Windows seem to have one problem or another, I guess it’s one of those cases where Microsoft’s docs are not particularly clear. Unfortunately, I don’t have many options to test this, as the only multimonitor dpi aware host I have is Reaper, besides AudioPluginHost, and an empty setScaleFactor seems to work in both. otoh, the base implementation doesn’t quite work in Reaper -the plugin is correctly scaled, but its window is not. With all the little workarounds, it’s hard to say if it’s a Juce bug or a Reaper bug -the same may apply to Bitwig.