Thanks, I get the same unknown error in all browsers, including that version of firefox. I'll check into that other thing you didn't mention:
System.ServiceModel.FaultException: The creator of this fault did not specify a Reason.
at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
at System.ServiceModel.ClientBase`1.ChannelBase`1.EndInvoke(String methodName, Object[] args, IAsyncResult result)
at WotC.ContentManagement.ContentVaultService.ContentVaultServiceClient.ContentVaultServiceClientChannel.EndGetOfficialContent(IAsyncResult result)
at WotC.ContentManagement.ContentVaultService.ContentVaultServiceClient.WotC.ContentManagement.ContentVaultService.IContentVaultService.EndGetOfficialContent(IAsyncResult result)
at WotC.XAMLUtilities.GeneralHelpers.<>c__DisplayClass14`2.<DoWebOperation>b__13(IAsyncResult ar)
at WotC.XAMLUtilities.GeneralHelpers.<>c__DisplayClassd`1.<>c__DisplayClassf.<DoWebOperation>b__b()