Broken window latch

I had a new full bath built in the basement last fall and chose to have a pocket door for it. We had had a similar door installed for a half bath upstairs a few years ago. The newer one (different carpenter) has become really difficult to open and close, and it's apparent that it's no longer plumb in its opening, leading me to think that it might be off its track. I'm really ticked, since the older one, which gets far more frequent use, was installed by a carpenter who had said he was "dying to install one", meaning he never had before. The newer one was at the suggestion of the carpenter, who said he did the "all the time". The angle of the space left when I try to fully close the door leads me to believe that it's the "leading" side of the door that has fallen, but so far my blind lifting and jostling hasn't been able to right it, and I think I can see and pretty much feel that the rolling hardware hasn't come loose from the door itself. Any thoughts on what might be wrong and how to fix?

We recently acquired a Series 400 french door (2 panal, both opening) by Andersen.....got a great deal in a liquidation sale - $500. I now have to buy the locking mechanism / hardware....one for each. All I can find is $400 each for Andersen brand. Are there any cheaper brands out there that will work? In my ignorance, I didn't budget to spend $800 on locks.....saw the $3000 door at $500 and pulled the trigger quick. Any advice where I can find an option less than $800 would be very much appreciated. Thanks Matt PS - First time poster.......If I failed to follow forum etiquette, please overlook this time!