I have talked with some colleagues about this issue and for one user that was experiencing the issue the problem seemed to be related to the version of PHP that was installed on the server. When the version of php was updated the problem no longer occurred. I'm not sure if this is an option for you but you should check as it might resolve the problem. I'm currently unaware of any other server configurations that would cause this error to occur. Please check on this and get back to us with what you discover.