How do I fix the wysiwyg editor's background problem
From JReviews Documentation
Some of Joomla templates can cause a conflict by applying site's backround as the wysiwyg editor's bacground also.
To fix this issue, add this to your joomla template's css file:
/* TinyMCE specific rules */ body.mceContentBody { background: #FFF !important; background-image: none; }
The fix is sometimes not visible immediately, clear browser's cache and check it later.