I have opened the Top Down (C++) sample project under 4.7 Preview 1 and there appears to be an bug preventing the player pawn from moving. When running within the viewport I get lots of the following warning messages generated:
Warning SimpleMove failed for UE4TopDownCppPlayerController_2: movement not allowed
(UE4TopDownCpp
is the name of the project).
I guess something has changed within the code base and the sample hasn’t been updated to support it?
Note: I get the same results under Windows 7 (x64) and OSX 10.10.2.