I have been having calendar issues with my TP since I got it in early July:
-None of my events show, regardless of the type of calendar - I have Google, Yahoo and Exchange accounts all running
-Reminders pop up 15 minutes before, so obviously the events are there, they are just not displayed in any calendar view
-I have contacted HP support who had me send some logs and allegedly my case is being escalated to 3rd level engineer
-WebOS doctor has been run as well as numerous erase and restore and all manner of deleting and re-entering all accounts and nothing works.
-The only small success i had was setting up an entirely new palm profile and adding my yahoo account which showed calendar events. But then when I added the exchange account my calendar stopped showing the yahoo events in every view but the day one.
I have no faith that HP will get back to me with a resolution, so the only other thing I can think of is that somehow it doesnt like the fact that I am sharing a palm profile with my Pre2 (which shows all my calendar events fine) so I will try deleting the accounts from the phone and then adding on the TP etc.
I have to say that if I didn't love other aspects of WebOS and the TP it would have been sent back weeks ago. Calendar sync is fundamental for me, but my patience is starting to wear pretty thin