Finally ID'd my mystery vine
 

If anyone is interested.....I spent some more time googling and finally
tracked down the name of the weedy vine that has been plaguing me. It's
Polygonum perfoliatum, mile-a-minute vine, also known as Devil's tail
tearthumb; both common names give a pretty fair description of what it's
like.

It was originally introduced into this country in the 1930's with a shipment
of rhododendrons into a nursery in York County, PA, and has spread from
there. Since I am in the next county over, it's no wonder I see it around
everywhere.

There's a good article on it he
http://www.nps.gov/plants/alien/fact/pope1.htm

Cheers,
Sue

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Zone 6, South-central PA