Hi knotacellar & Bassnote,
Thanks for contributing to our forum. I just reviewed our support case records and found that both of your were able to get assistance with the API errors you were receiving from our support team and have since posted the items in question successfully, so I am under the impression neither of your are still in need of assistance with these errors.
However, if you are still in need of assistance with any API errors you are receiving, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.
-Mike