I don't know if this is a Mac-specific issue, or a browser-specific one, but I'm having real problems with paragraph and line formatting when submitting and editing posts on my blog. The problem is, even in Code view, paragraph <p> tags aren't displayed, so it's really hard to work out where line breaks or paragraph breaks actually occur. When it comes to line-spacing, what I see in the editing window often seems very different from what I see when I view the site, which is very frustrating.
I'm mainly using FireFox 22.214.171.124 under MacOS X 10.5.1
In Safari 3.0.4 on the same machine, the problem is even more evident.
My blog ( http://machinesdontcare.wordpress.com ) uses the 'redoable light' theme (not sure if this is relevant).