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writes:

Thanks. It's a double-hung window - installed 5 years ago. I cannot
seem to find the maker - but it looks like the anderson double-hung 200
series. I do not see any "pulley/weight" system. The top window falls
on its own as soon as it is unlocked - it is supposed to slide down
only upon pulling it down. I do not actually see any mechanical system
after it slides down (or after pulling down on the top window). Not
sure how much more details to provide...

There seems to be a recall on the latch for that series:

http://www.cpsc.gov/cpscpub/prerel/prhtml01/01231.html