NGX OS Recommendation...
Hi Pam, et. al. - Check page 11 of the Introduction pdf -
"Choose a modern, 64bit Operating System: We strongly recommend that users run their simulator from a 64bit operating system. The best operating system currently available (at time of writing) for FSX is Windows 7 64bit. The advanced memory management capabilities of modern operating systems are far superior when running complex simulations such as the PMDG 737NGX."
If you're trying to run the NGX on Win32, you will run into problems! I'm using Win7-64, and I have not had the problems you are experiencing....the only problems I've had were occasional panel freezes, which seem to have been cured by hotfixes 2 & 3. (They happened using the EFIS/MAP DU layout...probably because of the added graphical strain over the PFD/ND style. Also, one freeze happened when I had to change an arrival RW & STAR. All happened prior to hotfixes). AP disconnect returns full control to me through CH yoke and pedals.
The only odd thing I'm experiencing now is the loss of the lower DU functionality when selecting the EFIS/MAP/side-by-side config - I cannot get the SYS page to display in the lower DU. (This may actually be how the real NG is, though. A couple of years ago when Southwest was still using the EFIS/MAP config, I asked a Captain about it, and she replied that SWA didn't use the lower DU. They switched over to the PFD/ND display in April 2010 to give them full RNP capability). So, it may be a moot point if the lower DU is not used with that "older" config. I did submit a ticket about it two days ago, though.
I hope you can get your difficulties sorted out, because the airplane is absolutely incredible....best airliner for FS that I've ever flown, hands down! (And I've flown all the rest - Level D, Ariane, iFly's NG, CS, PMDG744 & MD11, FT 733-4-5, etc).
Good Luck!