TYPO3 Ver. 4.1-dev
In htmlarea.js there are some lines of code, that walk through an array like this:
for (var plugin in RTE["plugin"])
Solution: Change "new Array()" for usage on associative array to "new Object()".
See my experimental changeset at http://svn.t3.digitaldistrict.de/cgi-bin/trac.cgi/changeset/5716
The Inline Relational Record Editing Project uses prototype.js to handle AJAX calls and to do some DOM-stuff. On using the htmlArea RTE together with Inline Relational Record Editing, the mentioned errors occur.
(issue imported from #M4469)