Gentlemen,
Thank you, one and all, for your input. Much appreciated.
The basic problem seems to have disappeared but I am no nearer identifying the cause.
In the last 60 minutes have been trawling through the Content Manager listings for two stock routes and four WIP's that were showing the fault initially. "Revert to the Original was "greyed out" and was not an option for any of these routes. No "Errors or Warnings" were listed and the Dependency, "Bulk Load" K:3:10040 was showing up as "fault free" in all searches.
Inexplicably, my trawl through thes asset listings seemed to kick-start the curative process and the fault listings then progressively disappeared from all routes as they were re-opened. TRS22/PC indigestion?????????
Again, many thanks
John