Are you using Firefox or a more current version of IE? Some people have reported having issues getting them to credit with FF. Might I suggest you change browsers and use a different one than you have been using? Let me know if it works for you.
I use Firefox for all my surveys and don't have problems with credits. I'm using Firefox version 3.5.9, if that helps anyone.
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.9) Gecko/20100315 Firefox/3.5.9 ( .NET CLR 3.5.30729)
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