Dragging Photo/s to Map won't populate location with graphics acceleration is turned on

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That's very unusual -- the graphics processor is far removed from updating metadata.  A couple of troubleshooting steps that might narrow down the problem and possibly get an actionable bug report filed:

1. a. With the GPU enabled, drag a photo to the map.

b. Go to Library.

c. Restart LR.

d. In Library, select that photo look in the Location tagset of the Metadata panel in the right column.  Does it show the GPS coordinates? Does it show City/State/Country?  E.g. 

The last couple of major versions of LR have had lots of bugs with caching of metadata, many (most?) of which have been fixed, but perhaps you're tripping over another one.

2. Can you make a short screen recording showing the misbehavior and attach it here?  If you make the LR window as small as it can get, and make the recording short, you should be able to attach it directly here.