Thanks, Renee! The about box is not displayed when you select "About BetterZip" in the menu? That's strange. Do you have a multi-monitor setup? Can you open the BetterZip preferences window?

You can select BetterZip in the Finder and select "Get Info" from the File menu. The version is displayed in the info window. Alternatively, you can look in the Read me file that accompanied BetterZip.