I honestly have no idea what you are talking about. This post was also discussed in an administrative meeting today. There is no such problem that we are aware of. It has been tested on IE6 under Windows XP and IE8 under Windows 7.
The problem simply does not exist unless you are using some sort of script blocker, or something or other. Some kind of custom software may be interfering. I do not see how you are having problems. We are using the most advanced forum software possible on this site, and the WYSIWYG editor has had its moments, but creating a line break involves using the enter key after you complete a sentence. This is how every word processor has worked since the mouse was invented (give or take).
I am closing this thread because it is either is a ploy or completely nonsensical.