Currently Being ModeratedAug 22, 2013 2:31 PM (in response to cwbuecheler)
I finally determined the answer to this issue. My mac is an Intel Core Duo (NOT a Core 2 Duo), which is 32bit. The new iTunes Producer requires a 64bit processor. So unfortunately there's nothing I can do except buy a new Mac, which isn't happening. Oh well. Hope this helps people who are having the same problem!