Hi there all, I need some serious help ! I downloaded the PMDG 737-800 for FSX a few months ago and it was all working great but now for some reason everytime I fly the aircraft there are no letters/numbers showing up on my instruments eg: speed, hight, engine performance. I need some help. Has anyone had this happen to them or heard of it? I've had a look around on the net but haven't been able to find any true information. Cheers Steve 
Stephen, not meaning to shut down your thread, but you really should ask that sort of question at a place like the following, you're sure to get an answer...
http://forum.avsim.net/forum/432-pmdg-737ngx/