Terrific photos. I’m thinking it takes time to access the slideshow at Smugmug, and you need to wait longer for the process to be completed before trying again.
You may have covered this before, but what kind of spit valve/release does the Professional have? The one on the Solist is old style. Maybe this is influenced by the construction and material of the endpieces or two-piece bottom construction of the Solist.
I’m guessing that the tendency of the mouthpiece receptacle to break on some 36 key Hohners is at least partly due to the length of the usual two mouthpieces, as a result of which more leverage is applied.