iPhoto '08 not saving changes to photos??

Just getting around to working with some pics in the new iPhoto. Notice that when I adjust the photos, then go back to the roll, the changes are not saved. It automatically reverts to the version that I just edited. Anybody else finding this? How to fix?

In the previous iPhoto, when you would edit, then use the arrow keys to advance to the next photo, a dialog box would pop up showing that the changes were being saved. That does not happen now for me.

Here's the way I have been doing it: From the Library view (not the event view) I navigate to the photo I want to edit. I double click to make it full-screen, click on adjust, change to my liking, then either hit Escape to go back to the "roll" or the arrow key at the bottom to advance to the next photo. Am I doing something wrong?

Thanks in advance!