This really seems to be a Kontakt 2 problem, but the forums over there seem to get no real help, so I'll ask here as well.
I can't get the strad (or any instruments) to sustain fully in Kontakt 2. While holding down a key, I get about 7 seconds of a note, then it cuts off suddenly. I have "Sampler" Mode checked. It's as if it plays in one-shot mode no matter what I do. If I let it cut out then release the key, I do hear what seems to be a release sample.
This problem happens whether I'm in standalone, or using Kontakt as a plugin in Sonar.
I'm on a Pentium 4 2.52GHz, 1GB RAM machine, running XP Home. My card is a Delta 66.