Can you tell whether this slate is running in Legacy BIOS or UEFI boot mode?
If UEFI boot mode, then it will be because Samsung have not included a UEFI driver for their pen interface. If BIOS mode, then can you check that your policy has OSK *and* USB support enabled?
I'll check. For testing, I deployed it onto another Slate 7 with Windows 7 Ent on it and the same issue happened! OSK is unresponsive, but the OSK is there at bootup. It had worked with 6.2.1 though. Hmmm... Now the mystery deepens! I am going to remove EEPC 7 and put 6.2.1 back on it and see what happens on this Slate 7 with Windows 7.
I've just started testing EEPC7 on our new Slate 7 devices and found the same trouble with the touchscreen.
Using the stylus, rather than your finger seems to be working fine at this end though. Also, we had to enable the settings to always show Onscreen keyboard & always enable USB in the pre-boot to have the onscreen keyboard display.
From reading another thread on EEPC 6.2, the problem with Touch not working comes down to the hardware vendor not supporting/supplying the 'touch' drivers within the UEFI environment; so doesn't seem like much McAfee can do about this... Fingers crossed our users don't lose/forget their stylus when on the road!