there need to be a standard set for when things like this happen. The first thing to do would be to notify the affiliate by email/ICQ/phone. If there is no response, the next step would be to prevent access to the account temporarily.
Either way might get the attention of the webmaster in question.
For example, I know that that personally I've switched addresses several times last year, some of which are in different countries.
I also have numerous affiliate accounts some of which I send traffic and others I let sit. Sometimes things slip though the cracks, so to speak.
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