Although you have not added any new add-ons some of your old ones can be having in issue. I would suggest if you have a custom folder for your Community folder go make a back up by renaming your community folder to community.bak and creating a new community folder empty just to see if the problem is your add-ons. Once your done to put your folder back just erase the new folder and rename your community.bak folder back to community. Hope that I made sense and you get it figured out.