Greetings smalljim, welcome to the Forum !
Let me make sure I understand the routing,
Coax into VCR, then another Coax from VCR to TV, right?
No A/V Cables to TV.
Just as a guess at this time, sounds like you aren't selecting your TV Channel to watch the right Channel on the VCR.
That would be either channel 3 or 4.
When the VCR starts to record, try changing the TV to channel 3 or 4.
May I presume you can't watch one channel, while recording another?
Also, what's your TV Source, OTA or pay Cable?
Have a good Day !
S.W.