Problem solved
Well, I spoke with Jeppesen today - the problem I encountered is that I downloaded the navdata update, then saved it to the hard drive. No problem with that. When I went to program the card, JSUM (their application resident on my computer) whined about wanting to update itself. I did that successfully. However, since the navdata file was downloaded prior to the update, it wouldn't work after the update. (Kind of basic stuff, shouldn't have puked liked that, or at least should have had a warning.) Jeppesen reset my counter, I downloaded the navdata file again, and problem solved.
So, data card seems fine, meaning the occasional glitches on the 430 may not be due to that...
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Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
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