Some others have reported similar symptoms in this bug report in the official Adobe feedback forum: Lightroom CC: Black bar in maps module and misplaced photos while geotagging on secondary monitor | Photoshop Family Cus…
I recommend that you add your me-too vote to the bug report and a detailed description of your symptoms, including the screenshot and the output from the Help > System Info command. My only suggestion is to make sure you update your graphics driver by going to the manufacturer's Web site: Adobe Lightroom GPU Troubleshooting and FAQ . The more votes and details, the more likely Adobe will prioritize a fix.
Thanks John, I've added my info to that discussion thread too.
After apply all latest windows patches, driver updates, and reinstalling the app (with updates), the map module appears to be working normally again.
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Great, thanks for posting an update -- that will help others.