I had same problem using a version downloaded this week.
The editor don't appears. The problem was solved when I renamed the htmlarea_bak.php to htmlarea.php (both in moodle_dir/lib/editor/).
Some new features don' t work with this solution, e.g., spell-checking, Search and Replace etc.
Now, I'm going to compare those files. Will be a good read, at least
Regards,
Edu Santos.
Brazil
Text editors
HTML editor gone to frell,after upgrade
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