

9 to 5 Mac points out that a growing number of users are reporting problems upgrading their iPhoto installations to the newest version included in the new iLife '11. According to the report, users are finding some or all of their photos disappearing following the upgrade process.
Suggested steps to take for those affect by the problem include repairing permissions and rebuilding iPhoto libraries. Of course, backing up the existing iPhoto library before upgrading is the most reliable method for ensuring that photos are not lost.Specifically, some people are losing some or all of their photo libraries when upgrading. Also, iPhoto '11 drops support for older AppleTVs as well as photo calendars.
Apple's Discussion Forums are lighting up with people who are losing data..
Article Link: iPhoto '11 Upgrade Causing Headaches for Some Users