etch - xorg crashes but i don't have any clue why

[sentiniate@tiscali.it]

i use etch, it is now at least 4 to 5 days that xorg starts and immediately crashes.
i did not do anything special to the system a part from upgrading daily.

when i launch startx the grey screen appears and immediately X crashes, but i do not receive any clue of what has caused
it in Xorg.0.log:

aldo@topolino:~$ tail /var/log/Xorg.0.log
(**) Configured Mouse: Emulate3Buttons, Emulate3Timeout: 50
(**) Configured Mouse: ZAxisMapping: buttons 4, 5, 6 and 7
(**) Configured Mouse: Buttons: 11
(II) XINPUT: Adding extended input device "Configured Mouse" (type: MOUSE)
(II) XINPUT: Adding extended input device "Generic Keyboard" (type: KEYBOARD)
(II) Configured Mouse: ps2EnableDataReporting: succeeded
Could not init font path element /usr/share/fonts/X11/TTF/, removing from list!
Could not init font path element /usr/share/fonts/X11/OTF, removing from list!
Could not init font path element /usr/share/fonts/X11/CID/, removing from list!
FreeFontPath: FPE "/usr/share/fonts/X11/misc" refcount is 2, should be 1; fixing.

i've modified xorg.conf in many ways; replacing "nv" with "vesa", replacing HorizSync and VertRefresh with very conservative
Modelines, but i could not solve the problem.

Any suggestion about where i can get better information about the crash?

thanks
aldo