Bookmarks and Recent Disk Images were switched over to use Core Data so there might be some growing pains. Sorry in advance!

Ample Changes

Bookmarks and recent disk images were switched to use Core Data
Added Bookmark editor window. Bookmarks can be deleted, renamed, or made the default.
The Default / Set Default menu items were removed since they're now handled as normal bookmarks.
Recent Disk Images now allows sorting and searching.
ROM window now displays the full machine name. The tooltip will display the short name.
Fixed some issues defaults not always loading software and disk images when starting.

MAME Changes