The new 2007 release has a rather serious (but easily worked-around) bug. In several screens, interface elements are distorted or entirely missing, making those screens unuseable. The workaround is to go into the preferences and change the "Look and Feel" setting to something _other_ than "Mac OS X". (I recommend setting it to "Metal".)

The only problem there is that the Preferences screen is one of those that is messed up, so changing the setting is a bit tricky.... The pulldown menu you want is there, but invisible until you click on it. Click around the lower half of the screen and you will reveal several popup menus. The one you want is about 1/4 of the way from the bottom of the preferences screen.

Good luck. Beyond this hopefully-soon-fixed bug, the programs works well.