When I use a template with a dark background I always get a dark background in my editor when I post news. This is not funny cause i can hardly not see what im writing.
The strange thing is that this only happen with template from rockettheme..hmm
In the Admin Panel, find Site Mambots/TinyMCE (or whenever editor you use), set the parameter of CSS Template to off (or no).
What happening is that the CSS file of the template is also set by default to be used in the Text Editor (usually TinyMCE) to be used. If the background is dark in the templte, the background of the text editor is also dark. Just select 'off' or 'no' in the parameters for the CSS template usage.