Too bad - these mouse can from nothing! Have the VX Nano had before and which had this double issue (the left mouse button responds when "single-click" as if one performs-matter a "double-click" the mouse which settings you have on your computer). Then Logitech Anywhere MX bought in January 2011 at Amazon, and now again the same defect. I use the mouse very much but two years should still hold at least - or? Now I have the salad with the chicken one because of the guarantee.
Addendum 28.10.2011: Logitech Anywhere MX has the recognized under warranty and I could submit free - let's see when the new mouse comes.
Addendum 02.11.2011: New Anywhere MX has been delivered - super customer service from Logitech! Thank you Logitech!
Addendum 23.03.2013: The exchanged Anywhere MX is still working flawlessly!
