I decided to give Google Chrome a spin. I tried to edit one of my blogs which is based on Wordpress. For some reasons, all paragraphs became one (long) paragraph.
I tried to edit it again. In the editor, the paragraphs looked fine but when I published the entry again, those paragraphs became one again. In the end I used Firefox to edit that blog entry. It worked.
Also, some stylings (like italics, etc.) were gone.
Long time ago I had similar problem with Safari, but it's fixed now. Maybe it's the same problem?