Cursor does not wrap to next line

When writing a post on my website some people are having troubles with the cursor not wrapping to the next line. It just keeps typing on the same line, but runs out “behind” the box. Two people at differnt times from different computers have complained about this, and this is not an intermittent problem.

One time I had to edit a post because it posted like this, with no breaks and it ran off the edge. It does it with comments also, but they post correctly (ie line breaks so it does not run off the screen)

I am running WP 2.0.2 on a Linux server with Bluehost. Both of the people having troubles are using IE, although I don’t know what version.

Thank you.