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i experience reproducable weird calendar insides when using recurring events, i appreciate substantial help:

I enter (by doublieclick) an event on e.g. may 9 2007 (18:30-21:30), then configure recurrence with the recurrence rule (x) weekly and recur on (x) wednesday. finally i configure "end after 7 occurrences".
after "ok" every date is shown in its weekly overwiew.

then i just switch to "summary", "email" or "contacts" and what happens is (WEIRD):
the events are no more shown from may 9 to june 20, but shown beginning on june 6 and repeating 7 times.
doubleclick shows the event configuration dialog with:
start date: 6.6.2007
end date: 9.5.2007
clicking on ok prods the message: "Appointment ends before it starts. Please correct date/time"
"data mutation" in .kde/share/apps/korganizer/std.ics is documented below.
It is not reproducable with another user and with same user and another ics-file.
I use the debian stable (etch, upgraded from sarge) and calendar in kontact (ver 3.5.5)

output of std.ics (esp DTSTART/DTEND)
nope:/home/michaelr# date;grep -n "Exc II" .kde/share/apps/korganizer/std.ics -B 7 -A 7
Sa 12. Mai 09:25:43 CEST 2007
6423-BEGIN:VEVENT
6424-DTSTAMP:20070512T072036Z
6425-ORGANIZER;CN=someone:MAILTO:micha@somewhere.org
6426-CREATED:20070512T072027Z
6427-UID:libkcal-475534926.1026
6428-SEQUENCE:0
6429-LAST-MODIFIED:20070512T072027Z
6430:SUMMARY:Exc II
6431-CLASS:PUBLIC
6432-PRIORITY:5
6433-RRULE:FREQ=WEEKLY;COUNT=7;BYDAY=WE
6434-DTSTART:20070509T163000Z
6435-DTEND:20070509T193000Z
6436-TRANSP:OPAQUE
6437-END:VEVENT
nope:/home/michaelr# date;grep -n "Exc II" .kde/share/apps/korganizer/std.ics -B 7 -A 7
Sa 12. Mai 09:26:25 CEST 2007
6423-BEGIN:VEVENT
6424-DTSTAMP:20070512T072036Z
6425-ORGANIZER;CN=someone:MAILTO:micha@somewhere.org
6426-CREATED:20070512T072027Z
6427-UID:libkcal-475534926.1026
6428-SEQUENCE:0
6429-LAST-MODIFIED:20070512T072027Z
6430:SUMMARY:Exc II
6431-CLASS:PUBLIC
6432-PRIORITY:5
6433-RRULE:FREQ=WEEKLY;COUNT=7;BYDAY=WE
6434-DTSTART:20070509T163000Z
6435-DTEND:20070509T193000Z
6436-TRANSP:OPAQUE
6437-END:VEVENT
nope:/home/michaelr# date;grep -n "Exc II" .kde/share/apps/korganizer/std.ics -B 7 -A 7
Sa 12. Mai 09:27:11 CEST 2007
6423-BEGIN:VEVENT
6424-DTSTAMP:20070512T072637Z
6425-ORGANIZER;CN=someone:MAILTO:micha@somewhere.org
6426-CREATED:20070512T072027Z
6427-UID:libkcal-475534926.1026
6428-SEQUENCE:0
6429-LAST-MODIFIED:20070512T072618Z
6430:SUMMARY:Exc II
6431-CLASS:PUBLIC
6432-PRIORITY:5
6433-RRULE:FREQ=WEEKLY;COUNT=7;BYDAY=WE
6434-DTSTART:20070606T163000Z
6435-DTEND:20070509T193000Z
6436-TRANSP:OPAQUE
6437-END:VEVENT
nope:/home/michaelr#

it does not occur if the calendar is run standalone (i/w korganizer)
so this may be recommended as a temporary alternative, if someone else comes across ...