Mining Pool Hub does things differently for some reason... It is one of the default pools, though.
Did you try it as a default pool? Just move up Mining Pool Hub on the pool list and enter your username
under "Pool Parameters."
[/quote]

Hi, are you referring to Pool Priorities and and Pool Parameters on the Default Pools tab? They are greyed, I can't select them. Likewise the Wallet Addresses are all greyed out. MPH is the only pool I have defined so far.

Edit: Ah, I found I had to UNcheck Use Custom Pool on the Compute tab before I could edit the MPH fields. I have moved MPH to the top of Pool priorities, set my MPH username and worker. When I go back to Compute, tick Use Custom Pools I now get this error, it looks as though GGS is typing to connect to a stratum server at MPH, is that correct:

018-04-30 16:15:00.5757 [3]     Line Number: 3769
2018-04-30 16:15:00.5757 [3]     StackTrace:     at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
   at System.Net.Sockets.TcpListener.Start(Int32 backlog)
   at GatelessGateSharp.MainForm.d__162.MoveNext()
2018-04-30 16:15:02.6072 [3] Exception: Only one usage of each socket address (protocol/network address/port) is normally permitted
2018-04-30 16:15:02.6072 [3]     Member:      Task_APIListener
2018-04-30 16:15:02.6072 [3]     Source File: D:\GitHub\GatelessGateSharp\GatelessGateSharp\MainForm.cs
2018-04-30 16:15:02.6072 [3]     Line Number: 3769
2018-04-30 16:15:02.6072 [3]     StackTrace:     at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
   at System.Net.Sockets.TcpListener.Start(Int32 backlog)
   at GatelessGateSharp.MainForm.d__162.MoveNext()
2018-04-30 16:15:02.9978 [1] Stopping miners...
2018-04-30 16:15:03.0135 [11] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0447 [22] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0447 [25] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0447 [26] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0760 [19] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0760 [23] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.0760 [27] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.1072 [20] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.1072 [21] Ethash stratum server failed to send a new job.
2018-04-30 16:15:03.6073 [1] Stopped miners.
2018-04-30 16:15:04.6386 [3] Exception: Only one usage of each socket address (protocol/network address/port) is normally permitted
2018-04-30 16:15:04.6386 [3]     Member:      Task_APIListener
2018-04-30 16:15:04.6386 [3]     Source File: D:\GitHub\GatelessGateSharp\GatelessGateSharp\MainForm.cs
2018-04-30 16:15:04.6386 [3]     Line Number: 3769
2018-04-30 16:15:04.6386 [3]     StackTrace:     at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
   at System.Net.Sockets.TcpListener.Start(Int32 backlog)
   at GatelessGateSharp.MainForm.d__162.MoveNext()
2018-04-30 16:15:05.9826 [17] Exception in Stratum.StreamReaderThread(): System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at GatelessGateSharp.OpenEthereumPoolEthashStratum.Authorize()
   at GatelessGateSharp.Stratum.StreamReaderThread()
2018-04-30 16:15:05.9826 [17] Reconnecting to the server...