Thank you, Dr Byte.

I think it may have been remedied now. After uploading the latest AIM files (the Sept 07 file you posted), the issue with the repeat order ids did get resolved and I asked the owner to perform a couple more test orders this morning. After he did that, I could see the orders come in and the transactions in Authorize.net just fine. There were no errors present in the Unsettled transactions area.

I told him that if he sees another error later related to the "processor", especially if it is when those unsettled transactions move to the "settled" area....that must be with the merchant account provider and he needs to call them. I also wrote an email to the merchant service rep to notify her about all the recent errors and tests.

So I can re-enforce that this kind of error with "invalid processor set up" or "invalid processor configuration" is related the merchant account, NOT Zencart or the AIM module.