#High Contrast Theme
When I encountered this issue here is the solution I figured out, and this was the only thing I had to do:
Overview: Use one of Windows10’s high contrast themes
How To:
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Do a search in windows start menu for “high contrast”
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Select one of the high contrast themes from the drop down or tiled list depending on your OS version. You can customize these themes!
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Click Apply
Now you will find all of the drop downs in UE4 that were either slow or not appearing at all will now work perfectly again.
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Rama