Uh.... bugfix.

OpenRa.Game/OrderManager.cs

@@ -164,23 +164,22 @@ namespace OpenRa.Game
 					throw new InvalidOperationException( "Wrong frame number at start of stream" );
 
 				var currentFrame = 0;
-				var first = reader.ReadUInt32();
-				while( true )
-				{
 				var ret = new List<Order>();
 				while( true )
 				{
+					var first = reader.ReadUInt32();
 					if( first == currentFrame + 1 )
 					{
 						lock( orders )
 							orders[ currentFrame ] = ret;
 						ret = new List<Order>();
 						++currentFrame;
-							break;
 					}
+					else if( first < 0x80000000 )
+						throw new InvalidOperationException( "Attempted time-travel in network thread" );
+					else
 						ret.Add( Order.Deserialize( reader, first ) );
 				}
-				}
 			} ) { IsBackground = true }.Start();
 			
 		}