I have a curious problem I haven't been able to figure out and am wondering if anyone here can help me sort it out.  Every flight with either the PMDG 737 or 777 I get the plane set up for takeoff and flight and after takeoff the plane will climb extremely slowly to a random altitude below 10000 and wont climb anymore.  The attitude of the plane is nose down 3-5 degrees and the wing flex is also curved downwards.  So far the only way to remedy is to load the plane in midair and reprogram the fmc with exactly the same weights and flight plans and the aircraft will climb to altitude just as expected.  I have tried reloading on the ground and starting with a dark aircraft and so far, no dice.  Any ideas?  

By the look of it most likely another silly addon has messed up your FSX environment... Happens all the time, that's why I'm very careful about installing things these days... Unfortunately if you can't pinpoint the variable that is broken, and no other user had the same issue fixed to post solution, you might be facing a FSX reinstall.

Think I read  this in another  thread  some  one  will confirm  this or not  think it  got  to do some thing  with the fsuipc .ini  file  if  you delete this  and let  it  rebuild  itself it  should  be  fine or  else  your  using  vatsim  weather    fsnn I believe if  you uncheck this .  hopefully  some  pone  will confirm  this

 

 

Doing  a  fsx  re install is  the very last  thing  you should  do