I've run into the following at a customer (Domino 9.0.1 + Traveler 9.0.1.3)
When a user is receives an invitation, the user can accept it both in the client as on their iPhone, and the meeting shows up in the calendar (both Notes client as iPhone).
In the Notes calendar, the meeting shows the green checkmark icon indicating it's an accepted meeting.
When the user opens the meeting on the iPhone and for example selects the "Comment to originator"' field and cancels out, the meeting disappears from the iOS calendar, but still shows in the Notes client calendar, but the icon has changed from the green checkmark to an icon showing a clock.
Anyone else seen this behavior, and more importantly, how can we fix this?