Since I installed the first Beta of OS X 10.11 I have found as many others have found USB 3.0 hubs do not reconize the Logitech MX Performance mouse when the Unfying receiver is plugged into the USB 3.0 Hub. I never had this problem with any version of OS X before installing OS X 10.11. I have tested this on to iMac's one Mac Mini and one MacBook Pro. I have also found using an iMac with Standard OS X 10.11 not beta and a USB 2.0 hub that when my iPhone was plugged into the hub iTunes didn't see the iPhone. I tried three different USB 2.0 hubs same problem. So the problem is not related to USB but USB and OS X 10.11. I have checked other forums and have found many other users with similar problems. Most of my Hubs are Plugable with the latest firmware. For either USB 2.0 or 3.0 hubs. Has this problem been seen before and is there an answer?
P.S. I contacted Logitech and they responded that the receiver should be plugged into the iMac USB port not a hub. I explained that I never had to do this before and they couldn't give me an answer.