exec wmaker & in /etc/xinit/xinitrc doesn't work

[cygwin-xfree]

Hi-


I want to run WindowMaker rather than twm, so I edited /etc/xinit/xinitrc and replaced

    exec twm &

with

    exec wmaker &

then when I ran 'startx', WindowMaker started  then immediately crashed.
 What am I missing here?

Thanks for the help.