I turned off SEO, removed OpenSEF - turned SEO back on in the control panel, reinstalled the new OpenSef version and now it works. But I did a lot of other playing around too - I am pretty sure it had to do with the OpenSEF installation so I would uninstall any of that you have and reinstall the new version as it works fine now on my system - try that and if you still have a problem let me know and I will try to track back on what I did...
Good luck!
Michele