To be clear, Taylor (our support) emailed both last night and about 20 minutes ago. The issue here is that our hands are completely tied by Native Instruments. SAC itself does not have any bugs here, therefore there is nothing we can change to fix the problem. Kontakt itself has issues, hence why the Kontakt 6 private beta fixed the issues w/ 0 changes on our end.
We are working directly with Dinos Vallianatos (lead Kontakt developer/programmer) providing him with debug information, forwarding customers, etc. That is the most we can possibly do. In our months of correspondence with them about this issue, at no point have they said we can do anything to solve this ourselves... it's entirely in their court.
I completely understand the frustration here, and if I were in your position I would feel the same way. Our tech support agent Taylor has just contacted Dinos again about any updates to the beta, since I believe the last one they sent has expired. In the meantime, if I were in your position and on a deadline, I would consider grabbing something like REAPER (free evaluation) to use temporarily to get MIDI parts rendered to audio and brought back into Logic.