problems with orders, please help

[DrByte]

You could try the authorize.net module from v1.3.7 as a test.

You'll need to grab these files from the v1.3.7 zip and copy them to your server:
/includes/modules/payment/authorizenet_aim.php
/includes/languages/english/modules/payment/authorizenet_aim.php
/includes/modules/pages/checkout_payment/jscript_main.php

I *think* those are the only dependencies.

After uploading, you'll need to go to your Admin, and Remove and then re-Install the AIM module.
I recommend enabling debug logging. You can inspect the debug logs in the /cache folder to see if any specific errors are being reported.

[shawnspookcity]

Holy crow...

That worked!!!

You're amazing.

[DrByte]

I guess the many bigfixes that have happened since v1.3.0.2 can make a difference

You might consider planning a complete upgrade ...