First, two preliminary comments to clarify the status;
1) This seem to come from the GNN quarterly report which pulls its "text values" from a concatenated file and distributes data from here on end. Thus, the dxpack file may have been "altered" or corrupted.
2) The actual "characters" missing or borked up are mostly spread evenly. BUT, they are constantly the same; a, e, etc. This indicates to me that...
-a) The corresponding Font may have been crushed at the glyphs layer.
-

The game itself resets (or attempts to modify) the GDI function for that particular Font once the call is made.
or
-c) The packaging process of final output has to fuse a number of lines which (while in transit between memory & display state) may be battling for resources. The clug happens, result is a mess.
In any case, the best way to figure these is to try a few copy/paste of "VALID default files" to either observe if the flaws cease or to pinpoint at the actual guilty process (if you know exactly what you're doing though);
-- Re-installing some default Fontsxxx.ttf(s) direclty into your Win/folder may give a hint.
-- Comparing the GNN dxpack file (as total bytes and/or content) with the initial copy may shed light on a tricky error, also.
-- Trying to see if the "FlavorText.xml" (or other appropriate xmls) might have some AscII/references screwed at binary level, since this stuff can happen - i've seen it more often than you may think in plenty of circumstances with such simple things as improper/interrupted defragging of drives and/or
pagefile.sys. Even viruses can kill a few files just by rewriting group of bytes at random.
-- Finally, the ultimate solution as a last resort; complete refresh with a sparkling clear new install.
So Question One is; Vista?
And Question two; Any modded components or "alternate" (or corrupted) files present?
- Zyxpsilon.