I was referring to an altitude conflict as in both aircraft travelling at 37000 ft and crossing paths. It looks as though FR can't be relied on in any case; as quite rightly stated other flights appear to vanish and to be in entirely the wrong place at various points also. Apologies for the waste of time.
Link to screen capture of perceived altitude conflict - just for the record:
http://www.pprune.org/members/429285...310-msruae.jpg