While recording, file size remains 0.0 B.

Hello HyperCam15YearVet,
Please let me explain, that by default Media Editor runs after the end of recording, this might take some time and might cause a black screen which probably will overlap any error messages.
1. Please try to disable an automatic Media Editor start unchecking "Options"-"Extras"-"Open recorded file in HC Media Editor".
3. Enable logging in the same settings page, then restart your HyperCam and try to reproduce the issue. Send me recorded log files.
2. Please generate send me a DXDIAG file of your configuration. Here you can see the instructions on how to get it.

Having same problem that I had with Ver 4 after installed today and after installing Windows 10, recently. 
While recording, file size remains 0.0 B. 
All my screens go black when I click stop so I can try to play recording.  All tests files show 0 size. 
The live stream in the background is still playing. 
I click into a black screen then all screens turn white and error message comes up giving me the choice to close or wait. 
Waiting never advances.  Ultimately have to close. 
Tried Version 4 three times and failed.  So, I upgraded to Version 5 and the same thing happens.
Please advise.