iSync.app dosn't show calendars (or shows them but won't sync 'em)

i was playing around with the CalDAV support in Leopard's new iCal.app - subscribing to CalDAV servers, WebDAV servers, publishing, deleting them again, etc. in the end i could see, edit, and update most of the calendars i wanted to. unfortunately, i couldn't sync them to my phone...

because:
calendars didn't show up in the iSync dialogue for my phone or
calendars showed up in the dialogue but just didn't sync


i cannot say i have a 'real' solution but at least things work again...

as the data of the calendars was not (i repeat NOT) stored locally i could just delete everything that seemed faintly related to iCal.app, iSync.app, my phone or SyncServices, i.e. i deleted the following files/directories...

~/Library/Preferences/com.apple.iCal*
~/Library/Preferences/com.apple.isync*
~/Library/Preferences/iCalExternalSync.plist
~/Library/Preferences/ByHost/com.apple.syncservices*
~/Library/Preferences/ByHost/com.apple.iCal.helper*
~/Library/Calendars
~/Library/Phones
~/Library/Application\ Support/iSync
~/Library/Application\ Support/SyncServices

...logged out (hm, i even rebooted) and started all over again: hooked up the CalDAV calendars into iCal.app, setup the phone for iSync.app and tried again. calendars are back and sync just fine.