Mach 5 v3 not seen in 64bit Cubase 6

I have just upgraded to Mach 5v3 but 64 bit Cubase doesn’t see Mach 5 v3 plugin when set to start up as 32bit or 64 bit ,both 32 bit and 64 bit versions are seen when Cubase 6 is in 32bit mode however,Mach 5 v2 is available in both 32 and 64 bit Cubase 6 .The only reason I upgraded was to get everything in 64 bit ,is this down to Cubase or Motu?