No I feel that your problem is, like Accord said, that you are wearing armor. While the Thief can wear armor, mages cant. Since dual/multi class characters have abilities and disadvantages of both classes, a mage/thief can wear armor, but, according to a mage's restrictions, cannot cast spells while doing so.
Mage robes however, will allow your mage to cast spells while wearing them.
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Why?
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