I am having a recurring problem when I try to add an event in the appointment book. It happens irractically. When I enter the event, add the time, and click ok, I get a popup that says "Invalid time". No matter what format I use, I keep getting the same message and cannot enter the event in the appointment book. If I go to a different day, I can enter the information ok. This problem never seems to occur on the same day of the week, but is increasing in frequency, even in different months.
