line drawing and display and xterms

[John]

Hello -questions,

If I ssh from a freebsd 11 machine to a 10.1R machine, where I'm running 
amongst other things, mutt and slrn in a screen(1) - if I resume the 
respective screen, all the nice lines showing threading turn into escape 
characters and mess up the display. What am I doing wrong?

If I ssh into the machine then export an xterm over ssh then resume the 
screen, it displays normally. I've not tried with other makes of xterm.

thanks for any advice
-- 
John