mouse frozen/locked in scroll mode

[juju43]

Hello,

I'm using Lubuntu 12.04 (up to date) on a Samsung netbook N230 and this last month, I had several times my cursor frozen after some time working on my desktop (default LXDE).

Cursor is frozen/locked but using trackpad scrolled windows.
Keyboard and the system is responding/working normally.

I recently reinstalled all the system, still with some configuration files restored (but I checked them) and the problem still happened.
One of my suspect files was ~/.config/openbox/lubuntu-rc.xml as I have disabled/enabled some shortcuts (and try to disable the trackpad scrolling)

Any ideas ? how to debug mouse activity ?

For now, didn't try external mouse as I haven't got one.

Thanks a lot

[juju43]

Quick note: doing a 'lxsession-logout' > change user got back the mouse