Apologies. I did search, I read both official Ditto 1.0.1 threads, and I searched for a number of pertinent phrases, but until today I had not realised that the forum search facility ignores anything within code brackets.
For the benefit of others, I have tracked down the thread by browsing.
It is here:
[Ditto] New request and strange url error
in Modules, Plugins & Snippets (not Modules, Plugins & Snippets » News, Blogs & Articles).
[EDIT: Or rather it was until I was sprinkled with Moderator fairydust and was able to move it]
This reiterates the point I made elsewhere that Ditto needs its own subforum!
May I suggest that any time a bug in the code is found, a link to the fix is placed in this thread?