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Will let you know if it helps.
Google spidereing these urls coincided with a 20% drop in my trafic which I at the time attributed to algo changes. Coincidence? I dunno.
I put in a base href to stop the rot when I dicovered the problem.
I now just checked again with the "site: search" and, lo and behold, the /// urls are no where to be seen.
So the good news might be that Google has fixed the problem?!?