Thank you, Julie for getting me running with ExamView on Mac OS X Lion! The short of it: snag ExamView version 7.51 and install on your Lion machine.
I’m returning to Mac mountain after many years in Windows world and Linux land (remember OS 8?). Relearning things as simple as keyboard shortcuts (CTRL+SHIFT+Q nearly gave me a heart attack in ActivInspire) and a backwards mouse (yeah, I understand gestures and still think it’s backwards) are definitely interesting experiences.
Megan Hayes-Golding 
I’m so glad that it worked for you! My favorite new feature is the ability to make the spaces between questions as large as I want.
Thank *you*. Oh and I could hug the ExamView folks! Huge question spacing has been a problem I was working around by pressing Enter about 20 times after the D multiple choice option. Hardly the way to go.
Megan, you can change the direction of mouse gestures in OS X. I googled it and found this as the first hit, which shows the setting that needs to be changed: http://www.mactrast.com/2011/07/how-to-reverse-lions-mouse-scrolling-back-to-snow-leopards/