Hi all, I've been using Logitech MX Anywhere mouse for years (ever since they discontinued the VX nano, which was the best mouse ever made). I have several MXA, which I use at home (mac) or at work (windows). I replaced a rMBP with a riMac last fall. My mouse was working just fine on the MBP, even after I upgraded to Yosemite. However, it never worked quite right on the iMac, with a fresh install of Yosemite. The click was unreliable (double click instead of single click, or no click at all) and it got worse and worse, until I finally stopped using it. The same mouse works perfectly on my MBA (Yosemite upgrade) and on my work laptop (Win7), so this is not a hardware problem. I did clean it and double check the mechanism. Things I tried : - Reinstalled (several times) Logitech Control Center (same version on all macs) - Cleaned and checked mouse mechanism. - Switched this mouse with the one (same model) i use on my Windows laptop - same problem. - Tried all USB ports, and a hub sitting on the front of the iMac. Now, I'm using Apple's trackpad, but I don't like it on a desktop. So I'm in the market for a nice, small, light, simple mouse to replace the MXA. One other requirement is that it has middle click. I did try the Magic Mouse back in the day, but didn't like it (triggered really bad hand/wrist pain). I've been a Logitech user forever. Any recommendations ? Thanks ! Note - no gaming mouse needed.