I've also changed how data is loaded when the sheet opens.
ISSUE FIXED. PLEASE REPORT ANY ISSUES IN SITE DISCUSSION
Sorry! I mean the calendar attached to your Control Panel, under the Event Reminders.
Clicking on Event Reminders brings you to the calendar:
Which shows you this beauty:
Which doesn't seem to allow you to set an event after December 2010. I wanted to set a reminder for one of my games, something I can easily do using external means, so no problem there. I just wanted to alert you guys to the problem if you didn't know already, or find out that the problem was on my end.