My ical has broken. The dock icon is as the picture untill you click it, then it loads the correct image. Also it does not laod any of the events until I click the to do items button in the left hand corner.
Oddities like this can occur if the iCal cache isn't cleared. Go to ~/Library/Caches/ and take the com.apple.iCal folder, move it to Trash, then restart the computer before you empty Trash.