Can't edit Exchange calendar entry w/ invitees

Hi,

I've got an intermedia Exchange account setup w/ iCal (aka Calendar in Mountain Lion). If I setup an even with invitees, I seem to lose the ability to edit that event. The calendar entry lists me at the organizer, but then has the Maybe/Decline/Accept buttons at the bottom as if I was an invitee. It also doesn't have the status of who's accepted or not like I'd normally see.

It seems to be working fine on webmail.

Thanks for any assistance.