Method 'ClearCustomFilters' does not have an implementation

Hi, since upgrading to v5.0.0 from MyGet I get the following when deploying to Azure; all assemblies are downloaded from nuget as part of the build, and all packages.config are pointing to 5.0.0 - any ideas?

[TypeLoadException: Method ‘ClearCustomFilters’ in type ‘ServiceStack.Host.ContentTypes’ from assembly ‘ServiceStack, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587’ does not have an implementation.]
ServiceStack.ServiceStackHost…ctor(String serviceName, Assembly[] assembliesWithServices) +0
HarbourAssist.Api.HarbourAppHost…ctor() +68
HarbourAssist.Api.MvcApplication.Application_Start() +80

[HttpException (0x80004005): Method ‘ClearCustomFilters’ in type ‘ServiceStack.Host.ContentTypes’ from assembly ‘ServiceStack, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587’ does not have an implementation.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +476
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +118
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +176
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +349
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +303

[HttpException (0x80004005): Method ‘ClearCustomFilters’ in type ‘ServiceStack.Host.ContentTypes’ from assembly ‘ServiceStack, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587’ does not have an implementation.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +657
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +89
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +189

I’ve rebuilt our projects from the latest sources, can you retry downloading from MyGet again after clearing your NuGet cache, e.g:

nuget locals all -clear