muka1004

I had the exact problem, and I tried to search for the answer, and I found yours. Thank you for posting this! Great help!

I have finally resolved this problem. You can find the resolution on the following link: http://forum.avsim.net/topic/389902-semi-unresponsive-plane/

I recently built a new computer for the better performance of FSX, thus I reinstalled PMDG 737NGX 800-900 base package. Whenever I reached the cruise altitude, somehow, "Autofail" light was illuminated along with Altitude was cancelled with sign "--------." I searched the support forum, and I found that it could be "pack" switches failed to set as "auto" and I made sure that all pack switches were properly set, but no success. The same problem. Thus I decided to exactly follow Tutorial #1, which began with "Default" way without changing any overhead setting, but I found the same problem. Before reaching FL250, I had "Autofail" indicator on, then eventually autopilot system became out of control. I assure you that I did all the best I could, but it seems that it would be something else beside "pack" switches. I would greatly appreciate any suggestion on this matter. I have attached the screenshots for your information. Here is the specification of my computer. Intel i7-4770 3.5GHZ 4th Gen EVGA GTX 780 3GB with Nvidia 327.23 driver (newest) Memory 32GB Tripple2Go Digital Edition connected with three monitors. (Resolution 3840 x 1024, 60HZ) Windows 7 64bit - Hardware Saitek Cessna Yoke, Saitek Cessna Trim wheel, Saitek Cessna Rudder CH Throttle Quadrant VRsim M-panel GoFlight Modules with Goflight PMDG Interface - Addons REX Plus with Overdrive Orbx FTX Global OPUS FSX (Only Weather) GSX AccuSim v2 GoFlight PMDG Interface Thank you for your attention.