[quote="nudel"]...If it doesn't work for you then your mouse drivers are probably not treating the middle mouse button as a middle mouse button. See this FAQ: Logitech Middle, Back or Forward buttons don't work.[/quote]Hello Leo...
I read - and acted upon - that advice when it first appeared.
The Logitech MX Revolution is the best mouse I have ever used, but the Logitech Setpoint software is perhaps the most annoying package I use. I am forever having to reinstate my preferences, and somewhere along the line, I must have inadvertently clobbered the MMB setting. All OK now.
Thanks.