I know, I’m sorry about the formatting. This web site uses WordPress which consists of a core product and then tens of thousands (and I really don’t exaggerate) plug ins, which are written by contributors. The whole lot is free and I pay nothing, except to host the site. The area for writing replies used to be perfect, but one of the updates (which come frequently) seems to have changed this, and as you say, the box disappears off the screen. However, if you keep typing it will go back to the left hand margin ok.
Some of you may have noticed that I have been going in and tidying up the line breaks in your posts. This shouldn’t be necessary and I have no idea why things have changed and I apologise for that.