Hi Peter,
FSUIPC4.236 was initially ( first 2 hrs) a great improvement with Vista, PMDG 747-400X and ASX. The only problem was the jumping speed tape (up and down by up to 400 feet around every 3 or 4 minutes).
However, I then realised I had no wind vector on the ND, so I restarted ASX, but that made no difference. So I saved the situation and restarted ASX then FSX. Commanded speed was then M.841 but aircraft stuck at M.783. Still no wind vector. But now I can't engage LNAV - just get the FMS message NOT ON INTERCEPT HEADING. Then the aircraft gradually veered to the left without my being able to correct it. Eventually got stick shaker so I ended the flight.
I know that not all of my symptom may be the target of your most valuable work, but I shall not fly again for a couple of days, so if you want any of my files just shout.
Regards, Richard McDonald Woods
Winchester, UK