I have a 2010 Mac Pro with upgraded wifi/bluetooth from OSXWiFi.com. Both wifi and bluetooth appear to be working fine as far as internet and peripherals are concerned, but I cannot get Handoff working properly. System Profiler shows Handoff as supported, but Universal Clipboard, app switching, and Instant Hot Spot are not working. Text messages, phone calls, and AirDrop are working, however. I have tried everything I know to do, including logging out of iCloud on both devices, resetting SMU/PRAM on the Mac Pro, turning off bluetooth/wifi on both devices, restarting the devices, deleting the bluetooth plist on the desktop, and disabling/reenabling Handoff on both devices. Nothing works! What else can I try?