The red tint issue is to do with the display of bridged views in plugins hosted out-of-process. The issue is on Apple’s side. I investigated this late last year: BUG? Popup Menu Background and Logic Silicon
I’m not able to test the drag and drop issue right now, but I suspect the observed behaviour is also due to the out-of-process bridging. Perhaps the additional window which shows the selected item is consuming mouse drag events. Could you try changing the true to false at juce_ListBox.cpp:128 and checking whether this allows the drag to succeed?