Might be your virtualvcr settings... App as downloaded is NOT set to U.S. defaults...
open app and click on settings > devices and make sure your card and correct audio device are selected. Also make sure "video tuner" is selected as video source. click on apply. then OK
Then select "tuner" tab > TV tuner device. Set country code to 1 (USA setting - substitute correct code number if residing in other countries) and tuner space to 0, tuning mode to TV and video standard to "NTSC_M" ( again, USA standard) and input to your source.
Then, click on Autotune and let scan finish. Click on Apply. then OK
Close window and click on "scan" in tuner window. Let scan finish. Again, click on apply and then OK.
If all is working right, click on Save in main window... You gotta do that or repeat above routine all over again if not done before exiting.