since 4.3.4, artifact-appearance at prompt

[Russell Hoover <rj@xxxxxxxxx>]

If, at my zsh prompt, I hit return several times quickly (to repeat the
appearance of the prompt for several lines in a row), such that sometimes
a blank line appears before the prompt does, I always now get, at the
leftmost column of the blank line, the appearance of a percent-sign
backgrounded in orange.

This has only happened since I started using zsh-4.3.4, and I'm wondering
what I can do to get rid it.

My prompt is this (minus colors):

[panix1:~]  [v4.3.4]  zsh  507 -->

And it is created by this line in my .zshenv (where it is all one line,
though these 4 parts of it are separated by two spaces between each of them):

export PS1=$'%{\e[1;32m%}[$red%m$white:$cyan%~$green]
[%{\e[m%}%{\e[36m%}v$ZSH_VERSION$green]
%{\e[m%}zsh%(2L./$blue$SHLVL.)$yellow%(2v:$grey/$yellow+%2v:)
$white! %$red--$yellow> %{\e[m%}'


I also have a right-prompt:

t7  Saturday  2007/11/03  19:28:21

created by this line in my .zshenv:

export RPS1=$'%{\e[1;34m%} %l  $yellow%D{%A  %Y/%m/%d  %T} %{\e[m%}'

I wonder what may have changed with version 4.3.4 that's caused the
artifact.  Thanks for any tips.

-- 
                         // rj@xxxxxxxxx //