Error after upgrading to 5.5.0

Hi 

After upgrading to 5.5.0 I now get the following error when trying to open the Enterprise Console. Does anyone know how to fix this?

Sophos.UIController.Extension.UIControllerException: Cannot retrieve session token after 8 retries. Please check that the Sophos Management Host service is running, otherwise see KBA 118513.

   at Sophos.UIController.IdentityServiceAbstracter.EndRetrieveSessionToken()

   at Sophos.UIController.UIControl.InitializeModulesDependencies()

   at Sophos.UIController.UIControl.<Initialize>b__b()

   at Sophos.UIController.Product.Logging.LogMethod(MemberInfo method, Action func)

   at Sophos.UIController.UIControl.Initialize()

----- [outer exception] -----

   -- error: 0x80004005 (Unspecified error)

   -- facility: Generic (System)

   -- source:   Sophos.UIController

   at class ATL::CComBSTR __thiscall UIControl::initialize(class ATL::CComPtr<struct IDispatch>)

   at class ATL::CComPtr<struct IDispatch> __thiscall bl::CReusingManagementServiceClientBroker::logIn(const struct util::UserName &,class Loki::SmartPtr<class bl::SubEstate,class Loki::RefCountedMTAdj<class Loki::ClassLevelLockable>::RefCountedMT,struct Loki::DisallowConversion,struct util::NoDereferenceNull,class Loki::DefaultSPStorage>,const wchar_t *,class bl::UIControllerBase &)

   at int __cdecl Run(int,class bl::CommandLine,enum bl::ConsoleType::Type)

   at int __stdcall wWinMain(struct HINSTANCE__ *,struct HINSTANCE__ *,wchar_t *,int)

Thanks David