Excellent detective work 
If I ever get past my services crashing issue (case still with WD, at least they’re talking to me now), I’ve give it a try.
BTW: if you raise a case & get asked to send system log data, be aware that if the extracted zip file exceeds 5mb (which it will if you have many indexed files on the MBL) your message will be dropped by WD with no warning to either yourself, or the recipients - good eh?
