I think there is something less than perfect with how VEPro saves data back to ProTools, and this issue manifests itself when large amounts of data have to be saved from a "coupled" VE Pro instance to ProTools. Kontakt4 seems to want to save more data back to ProTools than other VIs.
The temp workaround is: UNCOUPLE. Just like in the "old days" (last year), we save our VE Pro projects and metaframes on the slave, and connect manually. This is a sure thing.
HOWEVER, as I posted earlier in this thread, I think VSL engineering should take a look at this issue and build a better mousetrap. What is VEPro sending to ProTools that causes SO MUCH data that must be stored in the host session? I DO NOT BELIEVE this is PPC only issue, as a friend with a quadcore macpro host is having the same issue. The one thing we all have in common: Kontakt4 with large sets of samples. I think we are the "canary in the coal mine". I would love to see VEPro NOT embed its data to the host, rather LINK to a saved file, just like other professional apps (photoshop, finalcut, illustrator, quark, protools, etc..). I hope VSL engineering gets to read this. I'd love to hear back from VSL on this idea as well.
In the mean time, until something changes, IF we want to use Kopntakt 4 with VEPro and Protools, we're gonna have to run the old-fashioned way and UNCOUPLE.
I worked with 6853 all day and night on Saturday without any hiccups in any way, and I SIMPLY didn't use K4, else when I need to use K4, I uncoupled. No other issues.
Hope this helps.
J