Same trouble here ..... Coachmen Prism with Herr(?) windows.
I've reattached the pull piece twice (using wood block and hammer taps) but it keeps pulling off. Yes, I I've lubed the window tracks with silicone spray.
Looks like the only real solution is to drill holes trough both the pull member AND the window pane, then use screws/bolts to do the pull-window attachment. Is the window pane glass or something else?
I'd like to hear more detail about the adhesive approach.
Still more Coachmen 'quality'