I think your video card is your problem. There's been some reports about older AMD cards having issues with TTF fonts (the ingame fonts are the older fonts, so that's why those work).
Interesting that you say that, because my AMD card shouldn´t be working, the drive is corrupted due to a hardware issue which im going to fix soon, but then, why can i play FS2 with MediaVPS with texts working? Anyway, I think i know how to fix this.
edit: Yep, i´ve fixed it by disabling my amd driver mannualy so now its forced to use my on-board card. Thanks for pointing that out, i thought it was something about the files.