Spell Casting Improvement Bugged Shields

[TooManyK9s]

I can't hold up any shield (with D) and Hit monsters (with S at the same time) any more. Whenever I hold up the shield, I turn away from the monster I'm fighting. It seems that wherever my mouse last clicked, my body turns that direction (just as if I pressed S to recast a spell - so this new problem seems to be related to the spell casting improvements).