I am running duel boot Win 7 Hp 64 bit and Win 10 tech preview Build 9879.
When switching between O/S. I Have just noticed today that when coming out of win 7 and entering the selection screen my Key board does not work and I have to wait for the time out selection(win7 is set to prefered) then shut down the pc, switch on and all is fine again.

I know about the delay response time problems(next build fix) but anyone else had this new to me problem?.
Ps key board is wireless logitec Mk320 but worked fine untill today.

Topper.