[jpc763]

Originally Posted by BrokenLinkage

See the metal bar? There is an upper and lower bar reinforcing the opening. These bars are glued in place, but the glue ages hardens and loses grip, allowing the bar to shift just enough to catch on the sliding door.
If this is not your problem then IDK, but it should be discernible on inspection from below.
BOL

Nailed It Exactly!

Thanks for the help!

J