TinyPilot Pro image won't detect HDMI, but Community version is OK.

Hi all,
So, I've been using the TinyPilot community version for some time and enjoyed it so much that I decided to purchase the pro version.

I'm using the HDMI USB capture stick rather than the internal capture card (more on that later).

I reimaged the micro SD with the full pro version image and unfortunately, got the No Signal error. I tried re-imaging a few times, and retried, and also tried different settings in the config.txt file. Nothing.

I completely removed the TinyPilot pro software from the card and then reinstalled it with the curl .. sh command, but still, there is no signal.

Then I completely removed the software again and installed the community version, and it all worked fine.

Finally, I decided to go with a virgin Raspberry PI OS and then install the Pro version manually using the curl .. sh command, and voila, all is working fine. What gives?

By the way, I thought I would note for others with a KVM: The internal capture worked fine, but not very well with KVMs detecting signal changes. The USB capture stick works much better and is consistently working when changing computers via the KVM.

Thanks in advance!