Just completed a survey for sit down restaurants chains and after completing 20 minutes worth of questions, I got to the last "for classification only" questions and got an "oops. We are having technical difficulties" message and no credit. I have only been able to complete 2 surveys today

Don't know if this helps, but here is what the page looks like.
http://app.opinionplace.com/PassChec...000000&valid=1