I think that may be the root of the problem, but with the majority of my appointments being synched from my desktop, I don't want to have to go back in and change the "send from" drop down on each entry. I did not have this problem on my 8800, as all calendar entries whether originating from my desktop or my BB, would show on the Today home screen.
I'm hoping this is not a problem originating from the BES (enterprise) at my company, because I've discovered that "blackberry support" is definitely an oxymoron where I work.....