White no show text in new blog & page editors

I am new to WP just installed 3.3 with 2010 theme. My problem is in the text editor for posts and pages the text is invisible (white) although it is there as when I select all, it can be seen (but not edited except for ‘blind’ as it is all white).
I have trawled through the posts in this category and found this problem a number of times – but no solution.

Please help!

Bazzer2010