no border when doing vert_split

[DookTibs]

Hi - I just started using screen. One problem I'm running into is when I
split the window using the "vert_split" command, there is no visual border
separating the two windows. I do get a border when doing a horizontal split.
>From screenshots and forums I've seen around I know there *can* be a border
so I must have something misconfigured. For what I mean see attached
screenshot; this screen session has a horizontal split and then the top
window has been vertically split. You can see the blue statusline border
dividing things horizontally but the two vertically split windows have
nothing separating them.

I'm on Windows 7, running Cygwin. I'm using mintty as my terminal and bash
as my shell. From another forum post I've tried messing with the
"sorendition" command but haven't had any luck. I'm not exactly sure where I
should be looking even; is there a screen command for this, or is it getting
the divider configuration from the underlying shell? If it helps, my
.screenrc is:

startup_message off

hardstatus string "[%h] (%n) (%t)"
caption always '%{yb} %H %{k}|%L=%= %{w}%?%-Lw%45L>%?%{=b
bR}[%{W}%n%f%t%?(%u)%?%{=b bR}]%{= bw}%?%+Lw%?%?%=%-30= %{k}|%{=b C}%m/%d %c
%{W}'

defscrollback 5000

bind j focus down
bind k focus up
bind l focus right
bind h focus left
bind t focus top
bind b focus bottom

Any advice?

http://old.nabble.com/file/p35149605/vert_split_problem.png 
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