When does the problem occur?
Describe as accurately as possible, the steps that you follow.
I had no problem putting in polls, but I did encounter an error message between the top strip and the message box when having no question specified, and two error messages when I clicked Preview (both when a question was specified and when it was not)
Edit: I misread the post. I thought the problem was happening when you were creating a poll.
I'd still appreciate knowing the steps you took, even if it was just one. If you could, please paste the URL in the Address bar that is displayed when the error message occurs.