I had a problem with com.apple.syncservices and iCal 2.0.3 crashing which I cleared up by first creating then logging on as another administrator in order to test the problem. There was none, so I restored the backup under this admin then copied the entire folder back to my "real" account. I still get some delay in doing the simplest things in iCal (which was the precursor to the crashing problem), but at least it stays available. I read a post from May 26 which included re-installing iSync 2.2. But I can't find a way to download 2.2; even VersionTracker, while listing 2.2, actually downloads 2.1.
Might that be because there have been a lot of problems with 2.2? Is it OK to use 2.1 with 10.4.6?