Apple is aware of this issue, which appears to be caused by a conflict between the Tutorial and the DateBook Pro extension. However, until the exact cause is verified, when you want to use the Tutorial Part 2, disable the DateBook Pro extension in the Extensions Manager and then restart the computer.
The DateBook Pro Extension controls the alarms for DateBook Pro. Disabling this extension will prevent any DateBook Pro alarm notifications from appearing while you are running applications besides DateBook Pro.
The DateBook Pro Extension also facilitates access to Mini DateBook Pro, which allows you to perform DateBook Pro tasks without having the application running. Thus, disabling the DateBook Pro Extension will disable access to Mini DateBook Pro.