Get it here.
This is the first beta of 5.2.4. It has more changes than seem evident in the UI, but there are a few changes that might help you. Line endings with Blogger are improved yet again. The right text margins when you have text zoom set to greater than 100% should also be fixed. There are some changes to wiki links, internationalization, and Services as well. Please try it out and let me know of any problems.
The best ways to report problems are with the Report a Bug menu item in the Help menu or the MacJournal Support Forums. Make sure to include what version of MacJournal you are using.