write page screwed up – Help

I tried uploading advanced tinymce, but it didn’t work right so I uninstalled it and replaced the files. I don’t know if this is the cause or not.

Now, when I write a post, there is no automatic return when I reach the end of the text box. Instead, the text just keeps going and going. If I publish it that way, it just bleeds over to the sidebar. I’d have to manually hit enter to make the cursor move down to the next line and then continue typing.

Was it always this way? Did I screw something up? How do I fix this?