Allow Comments

I ma using the Twenty-Ten theme. I am having trouble with WP resetting my settings for comments. Every so often, the box that says “Users must be registered and logged in to comment” becomes checked. I uncheck the box and save the settings. But every month or so, it is checked again.

Also, after a recent update, I discovered that NONE of my posts had a place for comments. I searched and discovered a little check-box on the “quick edit” of each that had to be checked in order to “allow comments”. I went back through the ENTIRE history of my posts and checked that little box on each one to “Allow comments” and updated each. This morning, I found every one of them unchecked again.

Does anyone know why WP (or somethig else) keeps turning off my ability to receive comments? Is there any place I can set this universally that will keep it from happening? Again, the box in the settings that “requires people to be logged in and registered” keeps getting somehow checked.