Originally Posted by DonDee
On mine I used a large flat screwdriver to carefully widen the C channel a bit all along the length.
This will do it or you can get right up to the awning rail and attempt to move the awning just a bit over the whole length. It won't move much, probably a 1/16 or so at best, but it should tell you where it's hung up. A favorite trick of some installers is to squeeze the ends of the rail for an inch or six as well as use the traditional end screws. Check that closely too and apply a screwdriver as needed.