I have a curve 8300 and my problem is with the calendar.
I was getting an audible prompt and a pop up screen showing the appointment or task.
This suddenly quit shortly after installing internet and e-mail.
My wife got a new 8310, so I switched everything over to her 8300.
Calendar worked great, until a couple hours after downloading service books for e-mail.
Back to same problem, calendar blows by apointments with no prompt or pop up screen.
P.S. have checked profiles many times. Profile is set properly