You can ignore these warnings 'Cannot modify header information' if it follows another error.
Are you serving with a IIS server?
Then try to load tiny_mce.js directly instead of tiny_mce_gzip.js
tinyMCE.php
Code:
<script src="<?php echo $this->base; ?>plugins/tinyMCE/tiny_mce_gzip.js"></script>
to
<script src="<?php echo $this->base; ?>plugins/tinyMCE/tiny_mce.js"></script>
In firebug console you should sea JS errors no php errors, but it's possible that it shows server errors too, don't know exactly.
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