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Usually it's the other way around. Since the wacom.fdi is numbered 10 and the Synaptic .fdi 11, the Synaptic .fdi runs after the wacom one. It's almost always Synaptic grabbing things inappropriately.
I doubt it's Wacom causing the problem. What mouse are you plugging in? I assume it's a portable usb type. It could be X doesn't know whether to designate the pad or the mouse the core pointer.
You should take a look at:
and your lshal:
and see if you can tell what's going on.
Looking at your Xorg.0.log in /var/log/ will also probably be helpful.