What's the item you can't transfer? I don't have a Mac copy, but I'd like to try it in a Windows copy.
If the answer is money, that's a known issue in all versions. The workaround is to but a "-Custom Valuable-" for the correct price on one character, transfer that to the other character, and sell it for the correct price there. The other workaround is to subtract money on the journal tab of one character and add the same to the journal tab of the other character.
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