ICal: upgrade to OS 10.6 has created double home, work & unfiled calendars.

Having finally upgraded to OS 10.6.4 on my Macbook Pro, iCal now displays two home, two work and two unfiled calendars. My subscribed calendars haven't changed.
They are not duplicates, but each contain portions of my original, single versions of those calendars, so I'm unable to delete any of them.
I know I can create group versions of my calendars and put the doubles under a single heading, but is there any way to merge these fraternal twin calendars?
Thanks!

Welcome to Apple Discussions,
First make an iCal backup, File > Export > Archive.
Remove the following to the trash and restart your computer:
Home > Library > Caches
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)
__NOTE: Removing these files will remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
Once the computer is back up and running open iCal and test.
Hope that helps.

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