Calendar popup details

[Jerry Camel]

There is a setting under Options|Calendar Options|Planner Options to enable
calendar details popups in the planner when scheduling (or reviewing)
meetings.

I have one user where, although this is enabled, the popups aren't popping.
She has full access to all of the calendars that are included in the
appointment and can access the calendars and appts directly to see all
details, but it won't show it in planner view.

Any ideas?

Thanks

Jerry