danasan...that did it...I rolled back the driver (twice) and version 332.21, dated Feb 2014 did the trick. Urmel...I did indeed start by uninstalling GeForce Experience and all associated drivers; then reinstalled the first older driver I still had in my NVIDIA "apps" folder. That first one (344.11) didn't work, but the second attempt was a success...THANK YOU all!
BTW Urmel, I really must say the virtual world your team has created for LSH3 is quite remarkable, given the capabilities of a 10-year-old game engine. I've "navigated" in and out of Stralsund a couple of times now and I really like the looks of the shoreline...green grass and vegetation instead of sand, gravel and rocks. I was wondering though, the lighthouse on the northern shore of the Greifswalder Bodden; is that supposed to represent the Greifswalder Oie lighthouse, just "relocated" because the island itself isn't there?