I got this one too yesterday (not a good survey day for me). The URL for the blank page was a GF address, so I am hoping it credits even though it didn't show the congrats message. I'll post if I get credit for it today. I did report it as well since it said I finished the survey and the link back to GF didn't work right.
Edited to add: If all the weekend credits have come through, the Brainjuicer I took yesterday did not credit. Bummer.
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