18:54:10 Mission id: 822c1f5c8642b1650545eff573e1d4d1091e74bc
18:55:39 Bis_Heli (PO-30 Orca): Unknown action ListLeftVehicleDisplay, target Bis_Heli
18:55:40 Bis_Heli (PO-30 Orca): Unknown action NextModeRightVehicleDisplay, target Bis_Heli
18:55:41 Bis_Heli (PO-30 Orca): Unknown action NextModeRightVehicleDisplay, target Bis_Heli
18:55:42 Bis_Heli (PO-30 Orca): Unknown action NextModeRightVehicleDisplay, target Bis_Heli
18:56:49 Warning Message: No entry 'bin\config.bin/RadioProtocolENG.SentKeepDistance'.

Out of nowhere this warning message appeared when trying out the Helicopters Showcase.
I wasn't doing anything particular other than flying the PO-30 Orca in the early part of the mission.

When playing multiplayer, another error message appeared:
15:00:38 Mission id: 667f4d4de8f91a08c05f855b117a656285c26c6c
15:00:38 Fresnel k must be >0, given n=2.51,k=0
15:00:39 Ragdoll - loading of ragdoll source "Soldier" started.
15:00:39 Ragdoll - loading of ragdoll source "Soldier" finished successfully.
15:00:40 Loading movesType CfgMovesSnakes_F
15:00:40 Reading cached action map data
15:00:40 Warning Message: No entry 'bin\config.bin/RadioProtocolGRE.SentKeepDistanceInsideGroup'.