This is going to sound strange. I seem to have got into a parallel version of the forum - see first screenshot attached. I've now found a way back to the 'normal' version, by clicking Full Site at the bottom of the page (see second attachment - arrowed).
This is why I couldn't upload anything - the vBulletin version doesn't have the option. I don't know how I got into it.
Back to the issue, and the third attachment is the Scheduler Engine log you requested Bob.
Peter.