I just finished a DS on auto advertising. I got the thank you page within the survey, but I got Internet Can't Display this Webpage when it tried to route back to SR, so no congrats page. I refreshed and it told me I already completed the survey, but there was no submit button to send it back to SR.

It might have just been a glitch in my internet connection instead of an error, but I thought I'd mention it just in case.