The old blackberry curves work just fine. New curves and tours sometimes, but not always, get a red x went sending. I checked Send As permissions and they are fine.
A battery pull will always fix the issue. Thinking that this was a memory issue, I enable memory cleaning and set the Calendar to store 30 instead of 60 days. The problem hasn't gone away.
I'm think of upgrading the firmware on each, wiping, and then reactivating, but that seems a bit much.
Any other ideas?