After installing the Version 3.29.651.5 update on 9/23/2010, I cannot modify an existing calendar entry. I can delete and add, but cannot edit an entry. The edit function is missing.
Found the problem. You have to edit the entry on the agenda screen. Long press it and option menu will pop up, you can edit it. If you go into the actual entry though, it is view only. It's ridiculous!!!
I have the update and I can edit calendar entries from all of the 'normal' places - not just from the agenda screen. Have you tried rebooting your phone since the update?
Okay, if I edit an event that is a day or two in the past, say I change the name, it moves it forward a day. I edited an event from 9/22, changed the name from Headset to Headsets. when I saved it now showed up on 9/23. did this for an event on 9/23, now it's on todays calendar.
edit, weird, now I can't reproduce this, yet I did it twice. Sorry.
If you're looking at your agenda list, long press on the item you want to edit, and an edit option will pull up. But if you're looking at the item, you can't edit it from there.