I encountered a bug with imagevue 2.6.4 running fullscreen under Safari 5.0.4 and flash player 10,2,152,33 (Mac OS X 10.6.6). The screen fills with the background color of the imagevue gallery but nothing else is shown. Also, when I press esc. and go back to window viewing the gallery becomes stuck and I have to reload it in order to get it working again.
In firefox 3.6.15 it works fine, so it's a Safari issue.