Events Syncing, Then Disappearing from iCal

Question

I first noticed a strange thing, in that an event I'd put in several days ago had disappeared from iCal but still appeared in MobileMe and on the iPad, even after running a manual sync.
While thinking about that, I entered a new event on a different calendar but in that same weekly view. It was entered normally, all seemed fine. A few minutes later I once again was looking at the iPad, saw the new event had already appeared there and then, out of the corner of my eye, I saw something on the iMac screen blink. When I looked, that event had now disappeared from iCal! Again, it still existed in MobileMe as it should have done.
Two perhaps significant facts:
The two which disappeared were the last two events I had entered, and
all prior events seem to be still present everywhere as they should be.
As for testing in real time while writing this, this is what has happened so far:
Entered a test event into iCal, failed to sync to anywhere are all despite auto & manual tries. It has failed to show up elsewhere in all the following testing.
Tried a second test event, on a different day, and it did sync normally.
In addition, one of the two originally missing events now popped back into view on iCal, momentarily blinking off and then back on on iPad.
Several subsequent test events all quickly synced through as they should, but the first test event has never appeared elsewhere and the second of the original events to disappear from ical remains missing.
Beyond " .... ain't working right ...", I don't have a clue. Hopefully it's just a momentary hiccup, but I thought I'd pop this out in case anyone else was seeing anything similar.

Answer 1

Hi Michael,
Initially I suggest you quit iCal and delete the calendar cache.
Choose Home from the Finder's Go menu.
Open the Library folder. (If you are using OS X Lion, you will need to hold the Option key while clicking the Go menu in order to access the Library folder.)
Open the Calendars folder.
In the Finder, delete the Calendar Cache files, including any that also display a -1 (or -2, -3, and so forth) directly after their filename.
Open iCal and wait for the calendars to be rebuilt.
Let us know how this goes.
Best wishes
John M