this is my DefaultInput.ini,like this:
+ActionMappings=(ActionName="ViveRightTriggerClick",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Right_Trigger_Click)
+ActionMappings=(ActionName="ViveLeftTriggerClick",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Left_Trigger_Click)
+ActionMappings=(ActionName="ViveRightTrackpadDown",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Right_Trackpad_Down)
+ActionMappings=(ActionName="ViveRightTrackpadUp",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Right_Trackpad_Up)
+ActionMappings=(ActionName="ViveLeftTrackpadUp",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Left_Trackpad_Up)
+ActionMappings=(ActionName="ViveLeftTrackpadDown",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Left_Trackpad_Down)
+ActionMappings=(ActionName="ViveRightMenu",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Right_Menu_Click)
+ActionMappings=(ActionName="ViveLeftMenu",bShift=False,bCtrl=False,bAlt=False,bCmd=False,Key=Vive_Left_Menu_Click)
it’s worked.
May be you try to delete [Saved] directory,then retry.