I think this happened once on my other posts. The text went white when I posted this. I had to change it. I don't know if this helps anything but this is what happened http://wimg.co.uk/h0iHsd.png

What browser is this in? Are you copying the text from another source and pasting in into the editor (eg. another website or another program). And finally, what effects have you attempted to apply to that post? (eg. Centering it, bold some parts etc.)
The more information, the more chance I have of telling you why it is happening or fixing it

I am using IE 7 (I think it's 7) I am not copying it from anywhere, I'm typing it manually. I have not used any extra effects, I just typed it in and pressed post and it went white.

Is this a consistent problem? (Happening every time you post). If you go to "Help -> About Internet Explorer" it will tell you which version you have installed

Yeah it has happened 4 times so far. And I am using IE 7

I tried to duplicate that, and it was a no go. Possibly the installation?

Try to upgrade to IE8 and see what happens.

Can you try clearing your cache. It's possible that your computer has cached a version of the editor which is clearly not working right. Information on how to clear your cache can be seen at:
http://kb.iu.edu/data/ahic.html#ie7

Yeah I haven't had that problem for a while so maybe it was a temporary thing Just making sure it wasn't a bug. I'll tell you if it happens again