"The amount of upper corner pixels or lower corner pixels is == 0, font file may be corrupted."
I am using this font:
![Image](http://img231.imageshack.us/img231/68/font0cs4.png)
I also noticed that the font images created using old IrrFontTool have some red pixels, or something like that in the corners.
Old font:
![Image](http://img57.imageshack.us/img57/7251/oldfontwk3.png)