I've just noticed this problem this weekend, while trying to write a new post on my blog.
Basically, the text appears to be in 'HTML Editor mode'. There is a tab for the Visual Editor but, clicking that doesn't change anything. All of the Visual Editor icons are also missing (bold, italic, etc.), with the exception of the Upload/Insert icons, which are present in both formats. In HTML mode, all the relevant icons are present.
I have already checked under Users > Personal Settings and the box to disable Visual Editor While Writing is unchecked. I have also tried checking and then unchecking it again.
Does anyone have any further suggestions? I haven't knowingly done anything that would've caused this.
I'm using one of the 'free' accounts so, I'm not sure of my limitations as an administrator...
Thanks for your time,
The blog I need help with is ollypj.wordpress.com.