Windows 1709 update that came out today breaks Claymore 10. It says the opencl.dll is now missing and will not start.
Update: Reinstalling the video card driver corrected the problem. Turns out the Windows 1709 Update dumps the video driver.
Good grief, thank you so much for that information! You probably just saved me two days of trying to figure out wth was going on since I (again) forgot to turn off the stupid auto-update.