Thanks, guys--I have been hitting 'return' at the end of the lines; so
that's what the problem must be.

One of those hard-to-break habits, I suppose.

Anyway, I'm just glad to know it's not visible at your end...

[QUOTE=SFVette]I've noticed that when I compose a post, the formatting looks fine--no strange breaks in between words. But after I 'upload' that post, what actually shows up on the forum always does have these weird breaks, which seem to occur without an obvious cause or reason.

What am I doing wrong, and how do I correct it?

Thanks--[/QUOTE]

As Dave suggested just let the text box do the line control and only hit the Enter key when you want a new paragraph.  That way the text of your message will be displayed appropriately regardless of window size.  In the Quote above I removed the 'end of line' markers to show the difference of how it would look.