iPhoto show a exclamation mark instead of the picture
iPhoto 8.1.2 (iLife '09) show an exclamation mark only, instead of the picture. The thumbnail overview shows the picture and in the edit mode I got the picture too. All the time I open the picture with Preview, I got the picture, but iPhoto can't. In general I have no problems with iPhoto, all pictures are shown.
My question, does someone know where the exclamtion mark (a black exclamation mark in a white circle) came from.
Thanks for any help,
Lutz
PB12, MB13, Mac OS X (10.6.4), AirPort Express/Extrem, 2,5" ext FW Drive