You may have been locked out from that particular patient's chart. Have another user login and go to the demographics screen. On the right hand side you will see an option to restrict chart access. Make sure your name is not on that list. Have another user uncheck it (you cannot unrestrict your own access)
Try that and see if that works. If not, contact me directly at mdabeck@harriscomputer.com and we will see if we can get it straightened out