Last time (a few days ago) when I was taking Pinecone's survey, my Google pop up blocker (in IE) was on. I logined the survey with my user name and password, when I clicked the start interview link, it took me to Pinecone homepage.
So I was trying to take the survey again, the system told me I already taken the survey.
Today I got another Pinecone's survey, before I start the survey, I turned off the Google's pop up blocker, and I completed the survey with no problem.
Just want to remind everybody: when take Pinecone's survey, you need to turn off pop up blocker.