After upgrading iPhoto only shows tumbrils

Question

I recently upgraded to iphoto '11. At the beginning iphoto crashed or got stuck. After following the instructions in some discussion forums (Rebuilding library, reparing permissions etc.) iphoto loads, but it only shows the tumbnail photos. The regular photos are shown as empty (and so are the books), i.e. iphoto recognizes, that there is a photo, but it just shows a blank frame. I opened the library package, and the regular photos all exist.
Please help.

Answer 1

I checked now the log, which goes like this (shortened):
11-12-28 10:06:34.814 iPhoto Library Manager 3.7.2; iPhoto 9.2.1; OS X 10.7.2
11-12-28 10:06:34.814 {
    copyHiddenPhotos = 1;
    dontCopyOriginals = 0;
    dontImportDuplicates = 0;
    mergeCombineAlbumContents = 0;
    mergeCreateLibraryAlbums = 1;
    mergeCreateSmartAlbums = 0;
    preserveComment = 1;
    preserveDate = 1;
    preserveFaces = 1;
    preserveKeywords = 1;
    preserveName = 1;
    preservePhotoAttributes = 1;
    preservePlaces = 1;
    preserveRating = 1;
    rawPhotoCopyMode = 2;
    useExistingDuplicates = 1;
    useXMLInfo = 0;
11-12-28 10:06:34.814 --- Starting rebuild of libraries (
    "/Users/User/Desktop/iPhoto Library"
) into library "/Users/User/Pictures/iPhoto Library (rebuilt)"
11-12-28 10:06:34.888 Getting photo information...
11-12-28 10:06:36.923 Opening library "iPhoto Library (rebuilt)"...
11-12-28 10:06:37.519 iPhoto launched (9.2.1)
11-12-28 10:06:41.000 Creating keywords: (
11-12-28 10:06:41.134 Creating albums...
11-12-28 10:06:41.134 Creating folder "aaa"
11-12-28 10:06:41.466 Creating album "bbb"
11-12-28 10:06:44.673 *** Error: Missing photo: no file found at /Users/User/Desktop/iPhoto Library/Masters/2002/History/Smart-m (Large).jpg
11-12-28 10:06:44.673 *** Error: Missing photo: no file found at /Users/User/Desktop/iPhoto Library/Masters/2002/History/IMGP0261 (Large).JPG
11-12-28 10:06:47.150 *** Error: Missing photo: no file found at /Users/User/Desktop/iPhoto Library/Previews/2011/13.12.2011/DSC00005.JPG
11-12-28 10:06:47.150 *** Error: Missing photo: no file found at /Users/User/Desktop/iPhoto Library/Masters/2011/13.12.2011/DSC00009.JPG
11-12-28 10:06:48.287 iPhoto quit
11-12-28 10:06:48.330 Opening library "iPhoto Library (rebuilt)"...
11-12-28 10:06:48.717 iPhoto launched (9.2.1)
11-12-28 10:06:50.136 Updating thumbnails...
11-12-28 10:06:50.137 Restoring iPhoto prefs...
11-12-28 10:06:50.524 iPhoto quit
11-12-28 10:06:50.568 Copying faces...
11-12-28 10:06:50.592 Opening library "iPhoto Library (rebuilt)"...
11-12-28 10:06:51.019 iPhoto launched (9.2.1)
11-12-28 10:06:51.019 iPhoto launched (9.2.1)
11-12-28 10:06:52.834 0 photos were successfully copied.
10173 photos could not be copied because they could not be found in the original library.  Click the "View Log" button to see which photos could not be found.
10173 errors occurred during the process. Click the "View Log" button for more details.
11-12-28 10:06:52.834 Search for the word "missing" to find photos that were missing from the original library and could not be copied
11-12-28 10:06:52.834 Search for the word "error" to find any errors that occurred during the operation