Error: Failure in Processing the Payment (ps_authorize)

[cwk]

There's a fairly active thread in the Authorize.Net area (http://forum.virtuemart.net/index.php?topic=46010.0 talking about getting this error message

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Error: Failure in Processing the Payment (ps_authorize)

The error code displays on the purchaser's cart and the cart doesn't empty out, but the transaction goes through with Authorize.

In the absence of support from developers some bold souls have published a couple of hacks.  I'm technical enough to be quite dangerous, but I prefer to stay out of code whose purpose is to move money.  I'd like to get some experienced eyes on this thing.  Can we get this into the bug tracker?  Or better yet, can you tell us what stupid user trick we're doing to cause this return code?

Thanks!