HELP! I can't export a slideshow out of iPhoto 11 (v9.4)

Please help me! I am going crazy and I have a deadline!

I am running OSX 10.7.5 and I just updated to iPhoto 11 (v9.4) and I cannot get my slideshows to export at all in any format.

I keep getting an error window that pops up and says, "The operation can't be completed because the item can't be found." (There is no accompanying error code.)

I was able to export earlier today before upgrading but now I need to export as a Quicktime file and I forgot to do that in iPhoto 08 before I upgraded.

Vast amounts of gratitude in advance to the kind soul who can save my a**.

K