Excessive bank angle with LNAV/HDG

Hello,

After many tests to understand my issue with the PMDG 737NGX, it is time to open up the topic to get your feedback.

Since I have installed my rig with W7 Pro 64Bits + FSX, I have noticed that my 737-800/900 + 600/700 expansion pack adopts excessive bank angle around the LNAV path (or even on HDG Bug mode), up to 60°. It oscillates around the LNAV path. Not only it is unrealistic but it creates a dramatic effect. I didn't have this under Windows XP.

My tests reveal that it happens mainly when winds are greater that (around) 35 kt. I made an attempt clearing the weather and thus the upper winds and the effect disappear.

I also tried smoothing the wind transition in FSUIPC but it does change anything.

Are there any specific tweaks to be adopted for the 737NGX under W7 64bits?

Your feedback would be much appreciated.

Rgds,

-- Pascal