Hi,
I’ve got the same problem : Error In Adding Poll
I noticed because de default poll was not created.
I do not use WP Multisite nor I have used it in the past, at least I dont remember doing so.
The weird thing is that I have the problem on just one instance of WP3.6 here :
https://www.flagworld.com/news/
I’ve installed and configured 4 other wordpress today;
https://www.flagworld.com/roadtests/ (Works fine)
https://www.flagworld.com/nouvelles/
https://www.flagworld.com/bruitsdepaddock/
https://www.flagworld.com/karting/
The last three work fine, even with some minor tweaking to translate to French.
So far I’ve tried completely deleting and re-installing a few times, it just does not work