It's not "interference" per se, it's just that there's certain aspects to how fonts are processed and displayed in Windows that can sometimes prevent you from being able to exactly 100% duplicate the look of certain real life things. They aren't "fonts" on the real airplane, they're LED elements. The "fonts" on the DUs and CDU aren't fonts in the traditional sense either, they're raster objects drawn by the symbol generators.

 

I'll try to get it looked at like I told Kevin, but honestly this is very low on the priority list.

Also, are those pictures lifted from Airliners.net? I have a feeling Tom will get a bit angry when he sees these..