Hi everyone, i've recently installed Public Beta 1 of macOS Sierra on my mid-2010 MBP (2.66GHz Core2 duo, 8GB RAM). I started noticing some freezes followed by crashes while using certain apps. I quickly realized that the cause of the freezing+crashing was actually the external mouse that i was using with these apps. The issue is repeatable both with my Razer Abyssus and with my Apple Magic Trackpad 2. Also, my MBP has stopped recognizing my external keyboard. it simply completely ignores it (the keyboard in question is a Leopold FC750R). For info, everything was working perfectly under ElCap. Has anyone encountered this before? I'd greatly appreciate any advice, as the current situation is pretty much unacceptable to me. TIA!