Someone will know a cure for this.... [smiley=thumbsup.gif]...!
..(it has happened to me before, in FS 2004).
It is something to do with the; "Fonts"....
They are either missing, or the program (FSX) is looking at the wrong Windows set.
It is an easy cure, once someone tells you how to do it....

...
...(I've long forgotten!)...

...!
Paul...

...!
...also...make sure the settings on your Graphics Card are correct!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.