Default Milestone 2 calendar sync problem

Hello guys,

I'm experiencing a problem with my calendar. I have 2 calendars synced with 2 gmail accounts (work and private). When I add a new item and I fill in a random name (not a name from my contacts) in the field "Who", the new item disappears afters syncing with my account. This happens with both of the calendars. If I don't fill in this field everything works perfect and when I fill in a contact, it also works but the contact then receives an invitation.

Does anybody has the same problem?