Corruption of end-of-turn symbols

[irishron2004]

I have run into a problem with the end-of-turn symbols which starts with the corruption of the unit recruitment report symbol.
I have been trying to get past the point of 80 regions held without this happening.The only mod used is Spurius's BigMap. Everything else is vanilla. I have used 2 different video cards with the same results so it can be replicated.
Specs: AMD64 duo-core 4600+, 3 gig ram, 320gig hd, WinXp SP2, M2TW update3. I have tried both nVidia 7500LE video card that came with the computer and ATI x1950pro that I bought thinkig this is the problem. All files and drivers are up to date.

The only thing I can think of is a memory leak and it's in the .sd files. Is it possible that the same symbol is being called by too many handles, in this case, recruitment report, path blocked, and others I don't remember? Can the symbols in the tga files it is reading too close together and bleeding into one another? Is there a way in the preferences.cfg file to turn them off?
Thank you in advance.

Edit: I pushed my campaign a little and had this happen. I am playing as England and on a couple of the end-of-turn symbols, England's diplomat.tga was trying to overwrite them. I also had a .tga from one of the units overwrite the accept and decline symbols. My only question is why?