In a dual display system with secure shopping running, the second monitor will be black when Snagit v10 is being used for screen capture. I have two dual screen systems, one with Win7 and the other Win10. Same problem on both. They use different graphic cards, so graphic cards or hardware acceleration is not the problem here. Solution is to uninstall the program.
Secure Shopping is a 32-bit program - the In/Uninstaller can be found in> C:\Program Files (x86)\Comodo