Hi Maya.
I'm using the latest version of VE-Pro (4536) on all computers. My two slaves are OS10.6.1, my main DAW is OS10.5.8 and the Kontakt version is 3.5.0.025.
The small template (5 Kontakt tracks and 3 Omnisphere) that I emailed you as an example of the midi tracks not working is still problematic. Even when setting it up I wasn't able to trigger the last two Omnisphere tracks 7 & 8 and have reloaded it numerous times to no avail. I've tried taking the second slave (unused in this example) out of the network but it doesn't make any difference unfortunately.
My ethernet hub is a 5 port 10/100 mbps switch. Not sure if this is relevant...
Thanks.
Nick
Edit: Just bypassed the hub altogether and plugged the MacPro directly into the MacBook Pro. Still the same problem, so I guess the 5 port switch isn't at fault.