It is simple to fix as long as you follow this exactly. I had the same issue with Organizer (version 10) on my MacBook Pro as you (Mountain Lion). I seems to be a OSx issue when a second monitor is attached at anytime and then disconnected.
1) If you have more than one display connected to your mac, disconnect all external displays.
2) Launch Organizer (So it is like your screen shot above). This is so you can see it fix as you go through the steps.
3) Go to Apple menu at the upper-left corner of the screen. Then click System Preferences
4) Click on Displays
5) Select a different screen resolution then what it is currently set to (try 800 x 600). Mine was originally set to something like 'Stretched'. At this point you should see the Organizer window fit to screen with the top Organizer buttons visible.
6) Set the resolution back to what it was before and confirm that you can still see the entire Organizer window.
7) This next few steps are very important. Close Organizer.
8) Relaunch Organizer to confirm that it is still correctly displayed.
9) Close Organizer.
10) Restart your Mac.
11) Launch Organizer and you should be fine now.
