Are you using python OpenCL (poclbm) in guiminer? If so, this problem has been happening for everyone in the last few days. See
https://bitcointalk.org/index.php?topic=1334.msg732164#msg732164Basically it shows that you are mining but the shares are not being submitted.
Anyway, the fix is coming up in Windows so just switch to Phoenix in guiminer or get cgminer for the time being. If you need direction for switching to phoenix, which is what I'm doing now, just ask.
Not really worth the 3 BTC to be honest but if you still want to send, I won't complain.
EDIT: BTW, I've also heard that using the older guiminer version works but have not tried this.