Any more ideas?

Hi Bruce,

I had a similar problem.. may be related. The "Return to Merchant" link on the PayPal site was throwing a DUPLICATED string back to PDTHandler. You can easily check if that's what's causing your problem. Before you click on the "Return to Merchant" link, right-click on the link, and copy it to notepad.

It should look like this (I've trimmed it at |STRING| so it doesn't scroll off the page):
http://www.yourwebsite.com.au/PayPal/PDTHandler.aspx?tx=|STRING|&st=Completed&amt=7.75&cc=AUD&cm=41&sig=|STRING|

HOWEVER, mine was duplicating at ?tx= and I was getting a return URL of:  
http://www.yourwebsite.com.au/PayPal/PDTHandler.aspx?tx=|STRING|&st=Completed&amt=7.75&cc=AUD&cm=41&sig=|STRING|?tx=|STRING|&st=Completed&amt=7.75&cc=AUD&cm=41&sig=|STRING|

If you're seeing the same prob, you just have to split the string, and you should be cool.

I don't know why PayPals site does it... but it's easy to cheat your way around it .

Rich

Thanks, Rich... but the Return To Merchant Button doesn't allow me to right-click and save. When my mouse is over it, though, the link appears at the bottom of the viewport and says only http://www.eranaturalbeauty.com/PayPal/PDTHandler.aspx. I tried it in Firefox as well, and there it linked to http://www.eranaturalbeauty.com/PayPal/PDTHandler.aspx?=Return+To+Merchant.

In case anyone is interested... based on something I read on the CSK forums, I decided to take myself out of the sandbox and go live. The payment process went amazingly smoothly, and I was promptly returned to my site.

Of course, then I had to go refund the sale, but that's trivial. At least I know that the cart is functioning properly!!!  Hooray!!! It just didn't want to play in the sandbox.