Interesting oddity:
- Open IE's Developer Tools from the menu or by pressing F12.
- Press CTRL-B or select the mouse pointer icon to select an element in the page.
- Notice that the font rendering corrects itself.
- Close Developer Tools.
- Notice that the font rendering reverts to ugly again.
It works as you say.
I think you are on to something here.
Perhaps someone with more knowledge than me can tell us why it works and maybe how we can use this oddity to force IE10 to render clear text by default.