Don't know if this was already posted (probably was), but in case not here is my solution.

I followed these instructions to take off the door panel. There you have access to the rubber weather striping on the interior side of the glass. if you pull that up, you can see that there was another seal underneath the visible part of the strip and if you got your tint done without getting the door panel taken off, it'll be bent out of shape. straighten that out and no more window squeal.

I did take pics (although they may not be great quality) but i don't have a pic server. I'll try to post them on some online album, or you can PM me if you want/need them.

 

you can also just spray a bit of graphite based lubricant into the slots where the window slides.. no taking apart the door