You may need to take a planer and plane off where it is sticking. That is if it is wood. Close the door and mark where it is catching with chalk or other removable ink.
Our 14 year old cord controlled blinds are all giving us trouble with raising and lowering and tilting. Many of the top mechanisms are coming unglued from the top. I ...
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I found this video very helpful for my door that was sticking:
https://www.youtube.com/watch?v=AzRqVgkjZaY
You may need to take a planer and plane off where it is sticking. That is if it is wood. Close the door and mark where it is catching with chalk or other removable ink.
Sand where it's sticking with sandpaper.