These issues seem to be related to OpenCL Code Builder and Visual Studio (2017).
After installing a new HD Graphics driver, my workstation has OpenCL applications that run from the command line but will not successfully run in the Visual Studio debugger.
Debugging in this state reveals that the platform count on my workstation drops to 1 (from 2) and only the NVIDIA OpenCL platform is detected.
The solution is to completely uninstall Code Builder, reboot, and reinstall. A simple Code Builder "repair" doesn't seem to work.
Once this is done everything is OK.
I suspect this has something to do with Code Builder's interception/instrumentation solution?
-ASM
