Hi Hullbreach:
I too have this problem running at 2560x1600. The stock game works fine, but when running TM you lose the chronograph and the conversion chart. Here's an old thread I started, where Jhereg created a fix for this problem. I haven't tried this fix in any of the later versions of TM, but the fix worked fine back then.
http://www.subsim.com/radioroom/showthread.php?t=122021
I'm sorry I can't help you more than that.