Not sure if anyone else can confirm this, I have been using steam's game platform on my Mac, tattiebogle's Xbox controller drivers and GamePad Companion from the App store stopped working in the DP4 release. The console thrown a IO usb error. I am dual booting mavericks and yosemite on different drives on the same machine. They still work in mavericks. but are dead in DP4.. anyone have this problem?