Eureka! While your answer didn’t solve the problem it did strike a chord with me. I realized that by viewing via firewire I was effectively using the DV codec. I tried rendering the animation using the DV/DVCPRO codec in AE and bingo, success!
The problem only presents itself on fast lateral moves but apparently it has something to do with the media100 codec being converted to DV during the firewire transfer.
Hopefully this will be helpful to anyone who’s experienced this annoyance.
Thanks again for your help.
m