Niels, you're 100% right. I was nervous about by-passing a security certificate that Apple had set up, but to go back to an old OS is like putting a bucket under a drip... so I used Sentinel, and fixed the drip. And I'm rather smug now, that I did.
The spirit of cooperation on these forums makes the world a better place.
Thanks Niels, and everybody.
GeoffPh
PS: It's hard to work out, but I think I've used Eyetv for over twenty years, and there's no alternative here in Australia. To lose it would be a serious inconvenience.
G