Logout causes crash

[Morearty]

This is probably related to the switch user problem I described in http://forums.linuxmint.com/viewtopic.php?f=90&t=207457 . No one was able to help with that, I hope this one will find a response.

Sometimes when I log out (Linux Mint 17.2 MATE 32-bit) the computer freezes and I get a grey screen. I have no idea what to do, so I restart with CTRL-ALT-DEL and I'm good to go again. But I'd like to fix whatever's wrong.

The grey screen offers more information, and when I click YES I get this message (I had to copy by hand, I hope I got it all right):

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X. Org X Server1.15.1
Release Date 2014-04-13
X Protocol Version 11 Revision 0
Build Operating System: Linux 3.2.0-75-generic .686 Ubuntu
Current Operating System: Linux ed-TPS01 3.16.0-38-generic # 52~14.04.1-U
Kernel command line: BOOT_IMAGE= /boot/vm linuz - 3.16.0-38-generic root=UUI
Build Date: 12 February 2015 02:49:46PM
xorg-server 2:1.15.1-0ubuntu2.7
(For technical support please see http://
Current version of pixman: 0.30.2
Before checking problems, check http://wiki.x.org to make sure you have the latest version
Markers (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown
(==) Log file "/var/log/Xorg.0.log", Time: Wed Nov 4 19:03:49 2015
(==) Using system config directory "usr/share/X11/xorg.conf.d"
Initializing built-in extension Generic Event EX tension
                                                                         40%                      
<EXIT>

When I click on EXIT I get

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The server is now disabled. Restart MDM when it is configured correctly.

Any ideas? Specifically, what is MDM and how to configure it?

Thanks for any help