Well... i have power windows in my car, and when i roll it up, it becomes very slow at the top. It also begins to tip foward (towards the front of the car) slightly, but that can be corrected by pulling the window towards the back.
So... it did this before and the result was a broken window regulator (it bent and sheered off).
Now, i took out the weather stripping and put it back in... no dice, however there was no slowdown without weatherstripping. Any other suggestions?