Chatter issues : Just as a heads up Salesforce have an issue not skuid.

Chatter issues : Insufficient privileges error when trying to create or edit records 11:26 am PDT, Jul 12 The Salesforce technology team has identified the cause of the performance issue whereby users are unable to modify records or post to Chatter. Customers may get an error message "You do not have permission to execute that operation.” We are currently deploying a fix to resolve the issue.

David, thank you for bringing this up, As of 4:08 PDT, it sounds like Salesforce has rolled back the patch that seems to have caused the issue.