LogOnline:Display: STEAM: Loading Steam SDK 1.32
LogOnline: STEAM: Steam User is subscribed 1
LogOnline: STEAM: [AppId: 480] Client API initialized 1
LogOnline:Verbose: STEAM: Initializing Steam Game Server IP: 0x00000000 Port: 7777 SteamPort: 7778 QueryPort: 27015
LogOnline: STEAM: [AppId: 480] Game Server API initialized 1
LogInit: WinSock: version 1.1 (2.2), MaxSocks=32767, MaxUdp=65467
LogOnline:Verbose: STEAM: Created thread (ID:23416).
[2016.06.10-09.27.47:823][ 0]LogScriptCore:Warning: FindSessions - Invalid player state
[2016.06.10-09.27.47:823][ 0]LogBlueprintUserMessages: [UMG_ServerList_399] Failed
[2016.06.10-09.27.47:824][ 0]LogBlueprintUserMessages: [UMG_ServerList_399] Listing: 0
It seems to fail due to an invalid player state, whatever that means. I don’t know of any Steam error that has a player state.