I can't find that topic.
This is similar to what it looks like where the linkage connects to the gearbox:
If you crawl under the car, you can feel around to see if something is jamming the linkage. If there is nothing jamming it, and if it were me, I would undo the linkage bolt to check if the gearstick still moves correctly on it's own. There is an indent in the gearbox selector shaft for the bolt to sit in, so it will go back together in the same position.