I confirm issue. Parent dllhost crashes with stack buffer overrun error and explorer window becomes disabled. You need to restart explorer process after that.
BigMuscle, I have a bug with tool windows close button. The bug appears when using win8rp atlas or themes by NoelC. I am using latest 506 beta build and latest win8rp atlas for Win10 (my system is x64 Win10 ver 1511 10586.11).