Several sites that have a lot of content have stopped updating altogether. The ones that I notice most are - Grantland - Triangle Blog; Grantland - Hollywood Prospectus; Hitfix Tvtattle; and MMAJunkie.
Right-click on the site and open Statistics. That’ll show you either what’s up or how often they really are updating. Remember to scroll to the bottom to see the raw log.
Ok, I will give this a try. I know they are updating because I visit their sites. All of the ones that are not feeding have undergone layout changes to their site recently, so I thought I might need to resubscribe.