It seems that every time I post and have to enter the message body, when I hit enter I double space.  For example.

That was one return from the last line, whats up with that?  It makes it very difficult, the only way to not double space is to type to the end of the line. 

Is there a way to disable this?

Well at least now we can read your posts! ()

Really Engmus, I think this was raised on Day One but if I remember correctly it's something that can't be changed.  Steve or Allan can probably comment further.  For me, I've gotten used to it.