Some additional items of interest:
1) Without evolution open I get the hang.
2) killall gnome-panel
3) run evolution from cli
4) click clock in panel and it works! Here's some cli ouput for your interest,
it means nothing to me:
(evolution:23788): libecal-WARNING **: e-cal.c:319: Unexpected
I was able to affect a positive change by opening evolution and deleting
some slow and or broken calendars.
Evolution with Exchange is broken (LP Bug: 207723), so I'm not too
surprised that it mucks up the calendar.
Mike
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Clicking on clock applet hangs gnome-panel