Hi folks,
The new Preferences window in b6.5.0 feel much more Mac-native, but some of the tabs require scrolling to see all their content, and that fact is not immediately clear. There are no scrollbars to indicate additional content "below the fold" (unless you just happen to start scrolling, then they appear), and scrolling in stand-alone Preference windows is not normal behavior for Mac apps. Normal behavior would be either...
The Preferences window defaults to the size and shape it needs to accommodate all the content on the largest tab
The Preferences window redraws its size and shape to show all the content of whichever tab you've clicked
Most Mac apps go with #2, including System Preferences.