Once I get the confirmation popup that the appt has been added, I have never lost an appt.
As for text disappearing from the comment box, I don't recall seeing this either.
But remember this is asynchronous, so it might get wiped by the appt you switch to and then does not have time to reappear when you switch back before you decide it has been lost.
Best thing is to to see if you can see a pattern, and to try and reproduce it.
Graham Chiu
Beta Downloads and Documentation Wiki