After reviewing your email, Marcus, I decided to go back to my original project with the Marcus Leech FM heir.  I saw that ultimately the reason I stopped was that the Osomocom block (from the gunradio 3.7 project) was not sending signal.  I could see this because the FFT graph directly connected to that output  was blank. I was able to get the original project working by creating a new project adding a osomocom block then copying the rest of the blocks from the original project and it began working.  At 2.4M sample rate it uses 50% of the CPU.  The project with the FMDemod heir block is at 89% CPU usage at 1024M.  Don't quite understand why but the old one works now and is more efficient.  I can post the block diagrams if someone is interested.

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