Hi all,

When I create a new "appointment" on the calendar, the calendar
cannot be edited...

For instance, I create a new appointment and accidentally post it to
my personal calendar. If I try to edit it to post to another
calendar, I get the message:

Item "15551" does not exist.

This circumstance seems to cause a lot of issues. If you try to
delete it, you will get another error message, or you will see the
event on the calendar with a transparent look. Do you have any ideas?
It is completely reproducible, it happens every time.