KeePassX 0.4.3 has just been released.
It fixes a serious regression introduced in 0.4.2:
Editing groups doesn’t work and might crash the application.
Please Download the new version if you have already upgraded to 0.4.2.
A Mac OS build will follow shortly.
Mac OS build is available, Windows build is on my todo list.
Windows build is available, Mac OS build has been updated to fix the wrong version number.