Approximately once a year, I have to revisit this forum in search of
the latest advice onthis 8500DV software. Today I wasted about three
hours befotre finding the right combo. Every once in a while, the TV
stops working entirely throwing an exception in ATIMMC.

What's pathetic is how the advice given by ATI is never right. The
driver-MMX combo that finally worked was the MMC that has a note saying
to use 9.0.2. I used it for a long time until the TV no longer worked.
I had a problem with some other graphic software which said I should
consider updating the ATI driver. I did that and the software then
worked.

I suppose some of this comes from the innumerable Windows updates as
well, the right hand biting the left if you will

Installed the latest recommended Catalyst driver from ATI, 6.5.

Anyway, thing is back on the air for now thanks to advice I found here,
to wit
uninstall old MMC
installing MMC 9.0.8 uci
then MMC enu

it only wanted to reboot at the end, which I did. I'd have posted this
in the same thread where I read the advice but the thread is locked.

I'm sure there are better graphics cards available but why change when
this one does exactly what I need?

Thanks again!