Thank you for the suggestion of the firmware udpate, Kenzya. That seems to have cured my woes. The update failed the first time. Then it said the firmware is up to date. I kept trying, and finally it update from version 19 to version 20. Within that same Advanced screen, there is also an option to force the camlink into Bulk Mode or Isochronous Mode. I forced it to Bulk Mode, and now it’s capturing flawlessly within Game Capture HD.
I was also able to change the audio capture device back to the camlink (as opposed to PC line in).
The link to the firmware update instructions here:
No longer necessary my arse…