If you want it not to affect you...first boot into original....quit....next open the resourcepack folder... use like 7zip, WinRAR to delete in the texture folder the fonts folder, if you see any other folder locations saying font delete that as well.... Then every time you load minecraft you'll have default fonts with your favorite texture/resource pack. I'm looking forward to 1.6.2 where they've fixed this.
Still occurring in 1.6.2