Just to throw in my two cents about the issue, I know that a few months ago I had the issues 3 and 4 excessively using an EVGA 780 motherboard. Back in March I did a pretty major computer upgrade. Admittedly, I have not flown the 747-400 as much as I would like to since that point. However with the few hours I've put on the bird, I haven't had the corruption since getting the Asus P6X58D motherboard. Also my audio is now via the Logitech G35 headset and I haven't seen the issue. My current specs as of now, without experiencing the issue are as follows:Asus P6X58DCore i7 920 @ 2.67 gHZEVGA GTX 2806GB Corsair DDR3 @ 1667Creative XTreme Gamer Sound CardWindows 7 64-bitI also have used many other add-ons such as the LevelD and Concorde X and have not experienced the skeleton issue with that. Also, I'd like to note that even with these new upgrades, I still get more freezes and lockups with the PMDG 747 than any other of my aircraft, payware or not.In regards to the questionnaire:1. Have you ever seen this issue happen with the PMDG J41?I have not seen the issue with this aircraft but have used this aircraft mostly since my upgrade.2. Have you ever seen this happen in Windows XP (32 or 64-bit)?I don't use XP hardly ever so I couldn't tell you.3. Have you ever seen anything like this happen in FS9?I rarely use FS9 but haven't had the issue in FS9.4. Have you ever seen this happen with a default aircraft or other aircraft you know to not be using custom sound?This has NEVER happened to me in a default aircraft. I've never had the issue besides with the PMDG 747.5. Can you reproduce the issue on a completely clean system?Yes I have had this problem before on a 100% clean Windows installation.