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On my MacBook Air, running Mac OS X 10.8 Mountain Lion, I have received (from thalys.nl) bookings of train tickets in .ics format.

The point, obviously, is to click them so they get added to my calendar.

The problem I encounter is, they open fine, I see the event "blink" into existence and immediately disappear from view. As far as I can tell, it's deleting itself instantly.

I do not know if I'm operating Calendar wrong (I do have 8 different calendars, for things as mundane as the public library opening times, for work, for my companion's workhours, etc), if Calendar has a Preference I should turn off, if I've got a bug, or if Thalys's ics files are broken?

Here's a sample edited-for-personal-info of these ICS files.

BEGIN:VCALENDAR
PRODID:-//iloveoutlook//iCal4j 1.0//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VTIMEZONE
TZID:Europe/Amsterdam
TZURL:http://tzurl.org/zoneinfo/Europe/Amsterdam
X-LIC-LOCATION:Europe/Amsterdam
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19810329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
BEGIN:STANDARD
TZOFFSETFROM:+001932
TZOFFSETTO:+001932
TZNAME:AMT
DTSTART:18350101T000000
RDATE:
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+001932
TZOFFSETTO:+011932
TZNAME:NST
DTSTART:19160501T004028
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+011932
TZOFFSETTO:+001932
TZNAME:AMT
DTSTART:19161001T004028
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+011932
TZOFFSETTO:+0120
TZNAME:NEST
DTSTART:19370701T004028
RDATE:
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0120
TZOFFSETTO:+0020
TZNAME:NET
DTSTART:19371003T034000
RDATE:
RDATE:
RDATE:
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0020
TZOFFSETTO:+0120
TZNAME:NEST
DTSTART:19380515T024000
RDATE:
RDATE:
END:DAYLIGHT
BEGIN:DAYLIGHT
TZOFFSETFROM:+0020
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19400516T004000
RDATE:
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19421102T030000
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19430329T020000
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
RDATE:
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19770101T000000
RDATE:
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20121011T123621Z
UID:20121011T123621Z-uidGen@10.120.1.231
SUMMARY:You travel from X to Y on 04-01-2013 19:19
DESCRIPTION:Travel from X to Y
DTSTART:20130104T191900
DTEND:20130104T223500
LOCATION:X
ATTENDEE;ROLE=REQ-PARTICIPANT;CN=me:mailto:me@mail.com
ORGANIZER;CN=NS HISPEED:info@nshispeed.nl
BEGIN:VALARM
TRIGGER:-PT2H
ACTION:DISPLAY
DESCRIPTION:You travel from X to Y on 04-01-2013 19:19
END:VALARM
END:VEVENT
END:VCALENDAR
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