.net - Unable To Programmatically Create Client DataCache In Azure In Cloud Only?

I have a Azure worker role that needs to use the cache in AppFabric. When run locally (Win7x64,VS2010) pointing at the cache in the cloud, it works fine.When I deploy the same package to the cloud (again pointing at the same cache), it produces the following exception:

Message: The type initializer for 'Microsoft.ApplicationServer.Caching.DataCacheClientLogManager' threw an exception.
Exception Type: TypeInitializationException
StackTrace: Microsoft.ApplicationServer.Caching.DataCacheClientLogManager.Initialize(DataCacheLogSink logSink)
at Microsoft.ApplicationServer.Caching.DataCacheFactoryConfiguration.Initialize(String clientName)
at CommunicationRole.CacheUtil.GetCache()

Having looked at the code, this is happening when this line of code is hit:

Dim configuration As New DataCacheFactoryConfiguration()

Nothing runs after this line is hit. As I've said, the configs between local and cloud are the same. I use the cache with the credentials as a session state provider in a web deployment so I believe the cache and access to it are good.My build machine has the November 2011 release of the Azure SDK, and Azure AppFabric SDK 1.5 installed.

The method to get the cache is as follows:

Imports System.IO
Imports Microsoft.WindowsAzure
Imports Microsoft.WindowsAzure.ServiceRuntime

[code].....