same problem here...it's on the passenger side floor. I too changed the cabin filter (which was dry and no evidence of water around the filter housing).
It's gotta be the a/c, and the drip is coming from just to the left of the blower motor and dripping down onto the carpet. I have visually inspected whatever I could see (pulled down the glove box to see wassup in that area) and felt for drips to no avail. Anyone ever tear the dash apart to get to stuff that's way at the top?
