Digital Guru, thank you for commenting on my question.
Windows 7 SP 1 clarification . . .
While recording a CSPAN video playing in a screen, using "Screen Capture," at times audio is playing while the screen is motionless.
When that screen-motionless happens, the video/sound capture stops but the Screen Capture recording pretends to continue recording.
It is at playback of the captured recording that it is clear the the recording terminated too soon. (Same results using other web sites.)
And, true, have no options to force recording through video pauses.
Windows 10 clarification . . .
Have an older Dell Inspiration 660S desktop @ Windows 10 connected to a TV for displaying slide shows.
Loaded Creator NXT4 on the Windows 10 Dell to see if NXT4 behaves the same: Yes it does.
Thanks in advance, Tony