I was able to do one or two this morning, but kept getting taken back to another problem child. Finally just let the site percolate for a while, and by 2:30pm it appears that the broken survey is gone and I have been able to complete several new ones...including one that had the same topic and dollar value as one that had given me problems earlier.
EDITED TO ADD: I take it back, a new problem survey has arisen from the ashes. Business & Employment for $3.50, Alex. I think I'm going to let it all rest until tomorrow.
EDITED TO ADD 2: Waited overnight, now all of the problem surveys are gone, and was able to attempt all surveys in my dashboard. That was a very annoying glitch this past weekend.