They don't say anything else. I just get that email address not match error when it comes back from Paypal.
I don't know if you read the last few pages of this or not so I will repeat.
This site AnimalArt had a perfectly working Zen Cart for 4 months. I am the host. I changed NOTHING.
An order on 09/28 went perfectly.
The next order on 10/06 was the first time it broke.
Something between those dates was changed at Paypal. I am sorry but it is a simple matter of deduction. I don't know why Paypal won't help me.
But I am getting rid of them as a processor as soon as I can figure out how to make the Google Checkout work in there.
I am not the most all knowing programmer, but I am logical and sane.
Does anything sound ary to you?
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