"Wuff --- Wuff" is the vbell message; to disable it, put "vbell off" in
your ~/.screenrc.

The broken backspace thing... hit the backspace key a few times while
running "cat" within screen for clues to its source. A common cause is a
broken terminfo description (usually on xterm-color, I think), that
erroneously describes ^? as the DEL key, rather than backspace. If
that's the case, then cat will show sequences like "^[[3~"; a
"termcapinfo <your-term> bs=^?:kD=^[[3~" in your .screenrc may fix the
problem.

On some setups, you may see ^@ for backspace when running cat. In that
case, your terminal configuration needs to be adjusted. Find some
setting related to "automatically detect backspace character", and set
it explicitly to ^?.

-- 
A subset of input keys temporarily stop working
https://bugs.launchpad.net/bugs/349636
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