Plugin stops playing after backspace is saved and GP is restarted

I am using a simple rack space using my Arturia 61 playing the Massive X patch called Harmonification. When I set it up it works. I save and after I restart GP it doesn’t play. I have signal to the input block no signal to Massive X all wiring is correct. Rest of rack space works. Repeated numerous times-same result. Re assigned sound to Arturia 88 same result. No widgets and for now just input block, plugin and mixer-just to get it to work. Any ideas?

Can you post the simple gigfile that has this problem?

Also, what version of GP? What plugin format?
What OS?

GP 4.5.8 OS OS 13.4.1 I have many other rack spaces using Massive X lead sounds and pads no problems with them.