Shower door needs adjusted- I need advice

[MCTroy]

Our wind jammer has the usual corner shower. The door panel doesn't want to latch after our last trip. If I lift up on it, the door will raise up and close. I think it needs something adjusted... I just didn't see anything obvious. Has anyone adjusted a shower door? I found this hinge at the top of the door. I didn't think I would tear into this part without a little instruction.thanks!

[MCTroy]

Sorry. Pic is side wise. The black piece is actually on the upper corner.

[MCTroy]

Wow, did i stump all the pros on the forum? No one knows how to adjust a shower door? That means i get to explore it this weekend. Which really means, i will be taking it apart and then hoping to get it back together again. Any advise?