I do post on a large breed forum. But I haven't found any devoted strictly to Saints.
But I did get my question answered on the other forum.. Basically the clicking is due to a lack of synovial fluid in the joints. Why that happens I don't know. But since Bubba is still young it is easily fixed with the use of Glucosamine & Chondroitin. Left untreated from what I've read it can eventually turn into degenerative arthritis or it could be the onset of arthritis.
I'm going to get my vet to check for degenerative arthritis when I get Bubba's hips X-rayed. Better safe than sorry.. And I'm going to start adding Glucosamine & Chondroitin and Vitamin C to Bubba's diet.