Underscan/overscan resetting

Since the recent update to macOS High Sierra (10.13.1 - 17B48), I noticed that every time my Mac Mini enters sleep mode I log back in, the underscan setting reverts back, it won't retain what I'm setting it to and consequently needs to be reset every time.

I'm using two (2) external Samsung 40" TV's as monitors, and didn't experience this issue prior to the update. Is this a known issue, or is there a work-around at this time besides having to reset it each time I login? Not a huge deal, but it is a bit annoying!