make sure the track that goes along the side of the jeep is all the way in, especially that corner. i didnt have mine all the way in and actually messed up my window, and the corner tab wouldnt go in. Once i finally realized what i was doing wrong, now it goes in perfect and easy every time.Thanks for all the input. Here is a pic of exactly whats wrong. No matter how hard I push on the corner it won't pop in.