I think there are strange interactions between some software and the Logitech drivers. E.g. [link|http://z.iwethey.org/forums/render/content/show?contentid=275067|#275067].

Sometimes using a later version of the drivers helps, sometimes there's some obscure setting that needs to change, sometimes one needs to unplug the mouse and plug it back in. It shouldn't be so indeterminate, but there you are.

It seems to happen more often with Logitech stuff than MS. I wonder why that is... </conspiracy>

:-)

HTH a bit.

Cheers,
Scott.