Sorry, on checking further this bug is also affecting other packages
such as open office. I am using a Microsoft mouse which pugs into a PS2
socket.
My guess is that this bug must be related to the driver that controls
the mouse, as it seems to happen across different software packages.
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** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/38158925/Dependencies.txt
** Attachment added: "ExtensionSummary.txt"
http://launchpadlibrarian.net/38158927/ExtensionSummary.txt
** Attachment added: "XsessionErrors.txt"
http://launchpadlibrarian.net/38158929/Xsessi