Cannot change "New Event" to an event name in iCal

Question

For several days whenever I enter a new event in iCal I can put in all the information (times, etc.), but it will not allow me to change "New Event" that appears at the top to the name of the event.  So I have several events now called "New Event," and I have to actually indicate the name of the event in the "note" section.  This is very problematic, because the "note" section doesn't show up until I click on the event.  Has anyone else had this problem and/or know of a solution?  This is my first time to ask a question, so I hope I did it right.

Answer 1

Before we conclude that iCal is broken (which requires an OS reinstall to resolve) lets test in a new user account to see if iCal works there:
1.) Create a new user account on the Mac: http://docs.info.apple.com/article.html?path=Mac/10.6/en/8235.html
2.) Go to Apple > Log Out
3.) Login to the new user and test iCal
If the same issue occurs in the new user then iCal should indeed be reinstalled:
1.) Backup your Mac: http://support.apple.com/kb/HT1553
2.) Reinstall your OS: http://docs.info.apple.com/article.html?path=Mac/10.6/en/8177.html
If the new user works then we know iCal is fine, its the data in your user:
Troubleshooting:
1.) Backup all your data:
Backup your computer Addressbook: http://docs.info.apple.com/article.html?path=AddressBook/4.0/en/ad961.html
Backup your computer iCal: http://support.apple.com/kb/HT2966
Backup your calendars on MobileMe.
Follow http://support.apple.com/kb/HT4226
Go to "backing up data" and then "Backing up from me.com/calendar"
2.) Reset the computer's sync services and then restart the computer: http://support.apple.com/kb/TS1627
3.) Test iCal