Half size wp editor

Hello

My post/page visual editor does not use the full size of the text area.
It only goes to about half before it decides to make a line break.(does not effect how it will look on front-end tho).

The html editor tab is working as it should.

I got it on nearly all sites i’ve made recently and first i thought it was just a Div that decreased the size, but nope 😐

Here is a screenshot that may help explain my problem way better 🙂

ttp://img90.imageshack.us/img90/1255/pageeditorstop.jpg

Is this just other bug in the wp-editor or does anyone have a solution for this 🙂