This is another "Shield" Monk AC question...
Does a Monk/Wizard or Monk/Sorcerer that cast 1st level spell "Shield" (which provides a Shield bonus) loss the Wisdom AC bonus?
Shield 1st level Arcane Abjuration (force) Spell...
"Shield creates an invisible shield of force that hovers in front of you. It negates magic missile attacks directed at you. The disk also provides a +4 shield bonus to AC. This bonus applies against incorporeal touch attacks, since it is a force effect. The shield has no armor check penalty or arcane spell failure chance."
Monk: AC Bonus
"When unarmored and unencumbered, the monk adds his Wisdom bonus (if any) to his AC and his CMD. In addition, a monk gains a +1 bonus to AC and CMD at 4th level. This bonus increases by 1 for every four monk levels thereafter, up to a maximum of +5 at 20th level.
These bonuses to AC apply even against touch attacks or when the monk is flat-footed. He loses these bonuses when he is immobilized or helpless, when he wears any armor, when he carries a shield, or when he carries a medium or heavy load."
The text states "when he(or she) carries a shield" . Thus Magical Force effects aren't carried.