I've used the forums, as I've heard that's better than going right to their support. The only thing that the forums told me were the hints that I listed above: clearing your cache, not doing too many in one day & alternating email addresses....so far, I have just had to choose offers that were not part of the multiple-offer ones (bigBuckSurveys, Insider Deals, Winning Surveys, etc)...the multiple-offer sites are the ones that I have problems with!
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