Screen status line renders differently in 4.2.1

[Greg Bell]

I have this status line:

hardstatus alwayslastline "%{= kG}[ %{G}%l ]%{g}[%= 
%{=kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= 
%{g}][%{W}%c %{g}]"


In 4.0.0.03jw4 it looked like the first attachment.  In 4.2.1 it gets 
random red characters mixed in like the second attachment.

Bug?

screen_4.00.03jw4.png
Description: PNG image

screen_4.2.1.png
Description: PNG image