HI,
This will mean that the items that store the settings for your normal account have some dodgy info in them.
These tend to be called .plists and are found in ~/Library/Preferences (A short way to write Hard Drive/Users/(your account)/Library/Preferences)
However first of all check the Contacts list app itself (formerly the Address Book)
Does this have your details at the My Card (Head and Shoulders icon) ?
In System Preferences > iCloud can you access this pane (separate from the Mail, Contacts and Calendars and the iCloud info in there) ?
If you can then delete the com.apple.ichat.plist and the com.apple.CalendarAgent.plist from the Preferences
To do this use the Finder > Go Menu > Go to Folder and type in ~/Library/Preferences
Find the two files and drag them to the Trash.
Restart Messages. (And the iCal app if you use it.)
10:06 PM Friday; November 30, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously