Yes - its a relatively common problem. It has to do with the vapor barrier. Mine happened after I had a window regulator replaced on that side. I then noticed a little water on the mat. I've brought it in 3 times to have it fixed. Right now they have the car - they have made their repairs and they are actually keeping it a day or two to make sure the fix takes - it rained like hell last night so that will be a good test. They should know today if they were successful. My service advisor has been great (and sympathetic) and is taking steps to make sure I don't have to bring it back for the same issue...