As far as I can tell, the 4th Edition Character sheet calculates the defenses (AC/Fort/Ref/Will) using only Dex/Con/Dex/Cha, but I'm pretty sure it ought to calculate using the best of two options. (Str/Con for Fort, Dex/Int for Ref and AC, and Wis/Cha for Will). Small issue, and I can work around it with the Misc. fields, but I'd appreciate not having to mess with it.