Accept Tentative Decline buttons grayed out

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I sometimes receive an invitation to an event in my Entourage calendar
where the Accept Tentative and Decline buttons are grayed out. There
doesn't seem to be any reason or commonality to this behavior. I often
receive an event that I want to decline, but I can't do it since the
buttons aren't available. When I go into my calendar and double-click
the event, I can only adjust my time to Busy, Free, Tentative, etc.

Does anyone know what causes this and how to fix this or why this
behavior is happening?

Thanks!
.

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