Ok, seems there's a bug in Lion / iPhoto or an issue on my iMac. When I've got iPhoto as a fullscreen app and I sleep the iMac overnight, something goes wrong with iPhoto. When woken up, the iPhoto app still takes up the whole screen but it's moved from its own space to the Desktop space where Finder is located (the next screen to the left is Dashboard). The Exit Fullscreen icon in the Menu bar is not there. If I choose the Exit from Fullscreen option under the View Menu, it shrinks down to normal app size but on a Linen background. I then have to select Exit from Fullscreen again as the option is still there and it returns to the proper Desktop space and I can then see my Finder window. Making it a Fullscreen app again returns it to its own space as it should do. This has only happened with iPhoto so far. Anyone else experience this?