MCE give wrong background in text editor

https://i242.photobucket.com/albums/ff63/ttcontributor007/tinyMCissue.png

Look I first I got all gradient blue background, and that I could live with it, but now half dark gray. What is the problem really?

The text editor seems to set its own bg to grey or sometime blue or such. I have no control over it, so what I can do is to disable the MCAdvance to get back the white bg. Is there a way to fix this?

Regards