I purchased a g700 from amazon and got it a few days ago. today the left click stopped working. I've done all the usual stuff to try and fix it, battery pull, reboots, software reload etc. Did some searching on logitechs support site and there a a lot of people have problems with the buttons on the g700. On one active thread there are at least 10 people with the identical problem. Logitech support is posting in the thread but so far there has been no solution found. The thread was started in 2009 and the most recent post is a few days ago. Everyone talks about how great the mouse is but it seem to be plagued with bugs. I guess I'm going to send it back to amazon.