Problem with boot of knoppix in xsession-> ... xinitrc...

Hello,

I'm Spanish and my Inglish is very bad, sorry.

I caught a Knoppix and remastering it with gnome. All ok, but in sometimes personal computer my knoppix (gnUPCix) don't boot. The error is in xsession, in the line:

Code:

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su -c "DISPLAY=:0 exec /etc/X11/xinit/xinitrc" - $USER >/dev/null 2>&1

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If I put in boot line "knoppix desktop=kde" or "knoppix desktop=icewm" my knoppix boot, but I want to work with gnome.

also, gnome-session consume 39,7% of memory... is very strange.

¿Whats the problema?...help, please.

Thanks.