Cant fg a suspended su (4.1.0-dev-7)

[Peter Whaite <peta@xxxxxxxxxxxxxxxxx>]

I've noticed that I cannot resume a suspened su session lately (It
happened in 4.1.0-dev-6 as well). 

       aragorn% /bin/su peta
       Password: 
       aragorn% echo $ZSH_VERSION
       4.1.0-dev-7
       aragorn% suspend
       zsh: suspended (signal)  /bin/su peta
       aragorn% fg %1
       [1]  + continued  /bin/su peta
       zsh: suspended (signal)  /bin/su peta

There is approximately a 1 second pause between the contined and the
suspended messages.  

Any idea why the su command re-suspends after the continue?

	  aragorn% uname -a
	  Linux aragorn 2.4.14 #1 Sat Nov 10 17:16:26 EST 2001 i686  unknown

  	  aragorn% cat /etc/issue

	  Red Hat Linux release 7.1 (Seawolf)
	  Kernel 2.4.14 on an i686

	  aragorn% setopt
	  autocd
	  noautolist
	  autonamedirs
	  autopushd
	  cdablevars
	  completeinword
	  extendedglob
	  extendedhistory
	  histignoredups
	  histignorespace
	  histnofunctions
	  histreduceblanks
	  histsavenodups
	  interactive
	  login
	  menucomplete
	  monitor
	  numericglobsort
	  nopromptcr
	  promptsubst
	  pushdignoredups
	  pushdminus
	  pushdsilent
	  shinstdin
	  zle
--
peta