2021247 - EPM Add-in hanging at "Loading environments and models..." Logon screen

When you try to log into the EPM Add-In, you receive a lock up / hang / (icon spins) at the "Loading environments and models..." logon screen:

After you close (Kill / End Task) Excel using Windows Task Manager, you get the message:

"Excel experienced a serious problem with the 'EPM Add-in for Microsoft Office' add-in. If you have seen this message multiple times, you should disable this add-in and check to see if an update is available. Do you want to disable this add-in?"

The following error may also appear in the EPM Add-in trace and log files:

The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.

The full error is below:

ERROR|BPCProxy|FPMXLClient.BPCProxy.AutoUpdate.AutoUpdateServiceHelper.GetAvailableUpdates||||||1|System.ServiceModel.CommunicationException: The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at FPMXLClient.BPCProxy.AutoUpdate.IAutoUpdateService.GetAvailableUpdates(GetUpdatesInput query)
   at FPMXLClient.BPCProxy.AutoUpdate.AutoUpdateServiceHelper.GetAvailableUpdates(String clientVersion) in d:\Olympus_100_REL_XLCLIENT\src\FPMXLClient\src\BPCProxy\AutoUpdate\AutoUpdateServiceHelper.cs:line 34

• SAP Business Planning and Consolidation 10.0, version for Microsoft
• SAP Business Planning and Consolidation 10.1, version for Microsoft
• SAP Business Planning and Consolidation 10.0, version for SAP NetWeaver
• SAP Business Planning and Consolidation 10.1, version for SAP NetWeaver
• Windows Server 2008 R2 Standard Terminal Server

EPM, BPC MS, Business Planning and Consolidation for Microsoft, SAP BPC FOR Microsoft, Spinning , KBA , defect , troubleshooting , EPM-BPC-MS , Microsoft Version , Problem