My window manager (xmonad) does not restore SIGCHLD signal handling. This is a bug, and I have reported it there already (http://code.google.com/p/xmonad/issues/detail?id=441).
However, the only programs this seems to affect are those run under gjl, which report:
Execution of 'eselect python show' failed
Couldn't get needed information.
to the top of /usr/bin/gjl fixes it. If you feel so inclined, this might be nice to add.