I may have a silly question..... Please don't shoot me.

I installed FreeBSD and XFree86 4.0.2 manually.
First, I installed "only" FreeBSD kernel and rebuild my own kernel.
Second, I installed XFree86 4.0.2 and upgraded it to 4.0.3.
Finally, I made my FreeBSD and XFree86 working except one problem.
I can not exit the XFree86 normally.
Everytime I click exit on XFree86, my system hang.

I don't know why.... :-(
My best guess is I didn't set up some environment variables.
Does anyone know what's wrong with it?

Thanks if someone could help me.

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Love is a game. Easy to start. Hard to finish.