I too am having problems with my comments section since about late July. I was wondering why I wasn't receiving any comments on my blog posts and I just had a person email me to say that my comments weren't working. My blog is: http://www.dabblesandbabbles.com.
When I try to activate it in Jetpack is says it's activated in a message above yet the icon remains greyed out and continues to say "activate."
I'd appreciate any help.