This app doesn't work with my keyboard K520 and Logitech Pebble M350. It sees my devices, but I can't connect them. Why? How can I switch the middle button on my mouse to another function like it was on SetPoint? And it's very annoying that I should register an account to switch buttons! This was the last time that I bought your devices. You know...the best is the enemy of the good. We dont need super-duper application to switch button, but it shoud work well!