A possible fix for iCal calendars not syncing with "iDevices"

Hi everyone,
I had this problem in the past with my iPod and suddenly the same is happening to my iPhone: Calendars are no longer syncing to my "iDevices". This started with 10.5 for me, but ymmv.
There are lots of  Discussions suggesting to export all calendars, delete and then re-import. Resetting the Sync History in iSync's Preferences is mentioned all the time.
I tried all that, but it never worked for me. Sometimes the calendars list in iTunes just went empty and other times it didn't show all my calendars or only very old, long deleted ones. Since the behaviour is the same with my iPod and my iPhone I could at least rule out a problem there.
But today I finally discovered the culprit:
I am sharing my calendars via icalx.com and it turns out that sometimes iCal simply "forgets" the URL I have set there and reverted back to .Mac which I don't use. Reverting all the URLs to the correct values solved the problem immediately. All calendars do sync perfectly again now!
So if you're having the same problems it might be a good idea to check the URLs of all those shared (and subscribed?) calendars in iCal...
Have fun!
Björn
PS: It may have nothing to do with it, but I also deleted the Birthday Calendar during the process and re-added it via iCal's Preferences.

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Had the same issue. Just went thru a chat session with Apple support and my issue go resolved. Posting the transcript of the chat session below. Hope this helps:
Wendy G. : Welcome to MobileMe Devendra!
Wendy G. : I see that you had some issues with syncing after you obtained an iPhone 4?
Wendy G. : I apologize!
Wendy G. : Can you tell me a little more about what is happening please?
Devendra : Thanks, somewhat frustrated as all was working fine till I was on my iPhone 3GS. last week switched to iPhone 4 and since then have been having syncing problems with contacts as well as iCal
Wendy G. : OK, I apologize!
Wendy G. : Do you have a complete set of contacts and calendars on the Mac right now?
Wendy G. : What version of Mac OS X do you have please?
Devendra : 10.6.4. i have all the data on my Mac
Wendy G. : OK, thanks!
Wendy G. : Please make a quick backup. Please open Address book and iCal on your Mac. Please go here: File>Export>Archive iCal/Address Book. Please save to your desktop.
Devendra : ok, just a sec
Wendy G. : Thanks!
Devendra : its done
Wendy G. : OK, thank you Devendra!
Wendy G. : Click the Magnifying glass at the top right of your monitor and type in "iSync" - when it appears in the list of found items - click on it. After iSync opens - Select the Preferences from the iSync file menu and then Click the Reset Sync History button.
Devendra : done
Wendy G. : Thank you! Please click the Apple logo and open the system preferences. Click the MobileMe icon and click on the sync tab and the advanced button. Click the "Reset Sync Data" button. Choose just the data you want to sync from the list. Make sure the arrow is pointing the right way (from the Mac to the Cloud) and select "Replace".
Wendy G. : Also, Devendra, do you currently have the software update 4.0.2 on the iPhone?
Devendra : yes I have 4.0.2
Wendy G. : OK, thank you.
Devendra : pl wait...its syncing
Wendy G. : OK, no problem
Devendra : While its syncing..what's the next step?
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Wendy G. : Then we will go back to Settings>Mail Contacts and Calendars and switch only the contacts to "On" and "Do not Merge" data, but we will need to wait until the syncing is complete OK?
Devendra : ok..its done on the Mac. i am on the Mail, Contacts and Calendar page of the phone. from where do I switch the contacts off?
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Wendy G. : No, please delete, the data will merge fresh from www.me.com, which is what we want!
Devendra : done
Wendy G. : OK, very good!
Wendy G. : Please go to Settings>Mail Contacts and Calendars, tap your MobileMe account and then select "Calendars" only.
Wendy G. : Please switch them to off, "Do not Merge" and "Delete"
Wendy G. : Once that is complete, then you will switch them to "On" using the same process, by selecting "Do not Merge" once again and "Delete" from the phone.
Devendra : Switched it off but after turning On again, it didnt ask me for anything, simply the switch turned to On
Wendy G. : OK, thank you.
Wendy G. : Please place a test contact and a test event on the iPhone, and also place on your Mac, to verify if the syncing has resolved OK.
Devendra : ok, pl hold on
Wendy G. : OK, take your time.
Devendra : my contacts list on the phone is empty
Wendy G. : Yes, that is expected.
Wendy G. : Please put a test contact there and the information will refresh from www.me.com
Wendy G. : Also please verify your iPhone is set this way:
Wendy G. : Go to Settings>Mail, Contacts, Calendars>MobileMe account, tap it>Fetch new data>Set your Push to "on" and select "every 15 minutes please.
Devendra : yes, its that way only
Wendy G. : OK, thank you.
Devendra : Just as I was creating a new contact, all the contacts came back.
Wendy G. : Once you have the test event and contact on the iPhone and the Mac, please open www.me.com and verify when they arrive there!
Wendy G. : OK, very good, thanks Devendra!
Devendra : Bingo! Its syncing fine now.

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A possible fix for iCal calendars not syncing with "iDevices"

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