I've witnessed a strange behaviour in Firefox.
When a cursor is at the end of a heading (H1-H6) and user presses enter, no new paragraph is created.
I've looked into a code at the place, where two <br/>s are removed in (wymeditor.mozilla.js) so this works OK, but since no new <p> is created the cursor focuses the paragraph that was directly under the heading before.
This does NOT happen when an enter is pressed at the end of another paragraph or not at the end of a header.
This happens on Windows XP and Vista, Firefox 2.0.0.6. Tested both on the demo that's on the web and on the 0.5 version (directory) from SVN.
THANKS FOR REPLYING, it's important for me.