[Urwid] '0' printed on before a redraw

[John Powell]

I have noticed something odd in the new environment I am working in and
thought I would ask if this was a known issue before I start digging deeper.
 
When I refresh the screen using 'clear' and 'draw' before the screen is
cleared a '0' character is printed in the lower left corner of the screen
shifting the screen up a character. This results in a 'jittery' redraw that
is quite ugly/annoying.
 
I don't see the issue when running in a utf8 environment however
unfortunately the environment I must work in is non-utf8.
 
Ring any bells?
 
Regards,
 
John
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