The message files that previously exhibited the issue, did not have the "automatically" added Line breaks within long passages of text. And without the css element the display was not correct.

Of course any message files with text with the line breaks did not expand off the screen as they "automatically" wrapped.

I suppose the question is how were the "automatic" line breaks previously getting added (that masked this issue) and why did they stop getting added?

I think it is a better solution to not add line breaks into the message files, instead handle the wrapping at the display.