Just got this....
. With the latest terminal chart update some airports are displaying future effective charts in advance of the AIRAC date in place of the currently effective chart. It is important to validate your charts prior to flying to ensure that all charts are rendering the currently effective charts. At the AIRAC date May 2nd, 2013, all charts will display properly. It is possible to view the currently effective chart by changing the system time back a week.
Would anyone care to tell me how to validate charts prior to flight?