Thanks for your bug report, more information is needed.
The way you describe it it looks like a permission problem on your mouse
devices.
1. Please attach your complete /etc/X11/xorg.conf.
2. Open a terminal and give the output of:
$ ls -l <device>
for each Option "Device" "<device>" in all InputDevice Sections of your
xorg.conf.
3. And the output of:
$ id <username1>
$ id <username2>
where <username1> is the name of the user that can use both mouses, and
<username2> is the name of the user that can't.
** Changed in: xorg (Ubuntu)
Assignee: (unassigned) => Pascal De Vuyst
Status: New => Incomplete
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Multiple mouses don't work with multiple users
https://bugs.launchpad.net/bugs/125340
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