SQL2012 SP1 breaks connection to Essbase through ADOMD.NET by furmangg

It looks like SQL2012 SP1 changes to ADOMD.NET broke connections to Essbase via ADOMD.NET. Now we’re getting this error:

Element 'return' was not found. Line 1, position 252.
at System.Xml.XmlReader.ReadStartElement(String name)
at Microsoft.AnalysisServices.AdomdClient.XmlaReader.ReadStartElement(String name)
at Microsoft.AnalysisServices.AdomdClient.XmlaClient.SupportsProperty(String propName)
at Microsoft.AnalysisServices.AdomdClient.XmlaClient.Connect(ConnectionInfo connectionInfo, Boolean beginSession)
at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Connect(Boolean toIXMLA)
at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.AdomdConnection.IXmlaClientProviderEx.ConnectXmla()
at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.ConnectToXMLA(Boolean createSession, Boolean isHTTP)
at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.Open()

.ClientVersion returns:
11.0.3000.0 ((SQL11_PCU_Main).121019-1325 )

Disassembling the DLL, it looks like the XmlaClient.SupportsProperty function is new. I guess Essbase doesn’t support DISCOVER_PROPERTIES? If there was a property you could set on the connection string to have it skip this code path, that would be nice.

I was able to install a prior version of ADOMD.NET and it’s working again. But a fix would be nice for the sake of others who might be using ADOMD.NET for this purpose.