[mythtvnz] MultiRec Turned Off?

[Tortise]

I have 2 500T, comprising 4 tuners each with 5 virtual tuners set, yet for some reason multirec does not seem to work, that is I can 
only seem to get one channel from each tuner.  There are 20 encoders in mythweb.  I cannot find a setting that turns off multirec. 
Tonight I have a recording conflict as I am trying to record 5 overlapping things....  I cannot find a setting about this, as best I 
can tell setting 2 or more virtual tuners turns multirec on and nothing should turn it off then?   (Mythbuntu 23565)

Can anyone suggest how its turned itself off or where to look to move this forwards?