[Solved] Failing MIDI/EZ Drummer project

SonarX2 Producer, EZDrummer (Pop/Rock or Americana kits)
 
I have a MIDI drum pattern (created with audiosnap on Sonar X2), which EZ Drummer (latest version) doesn't play properly.  I can see all the MIDI events in the event viewer, but not all the events are passed to EZ drummer (as far as I can tell).
 
I've managed to break the project down to just the drum parts, which I've linked here as a winrar/cakewalk bundle (900Kb). (https://www.dropbox.com/s/pog6uxmrwxff9vq/Failing%20Drum.rar?dl=0)
 
 
If you start playing from the start, a snare hit should mis-fire pretty quickly (although not necessarily in the same place every time).
 
I think it's something to do with the plugins (it seems to be better when they are all disabled).
 
Firstly, can anyone reproduce this problem?
 
Secondly, is there anyone at Cakewalk who can shed any light on the problem?
 
 

Flippin eck.  I've spent weeks twiddling this and that's all it was !
 
Thanks Steve.