Mine

Index: source/blender/python/api2_2x/Window.c
===================================================================
--- source/blender/python/api2_2x/Window.c	(revision 10916)
+++ source/blender/python/api2_2x/Window.c	(working copy)
@@ -1038,7 +1038,7 @@
 			printf("Doing WINIID NOT!!!\n");
 			/* set scene and viewport */
 			G.scene->lay = layer;
-			if (G.vd) {
+			if ((G.vd) && (G.vd->scenelock)) {
 				G.vd->lay = layer;
 	
 				while( bit < 20 ) {
@@ -1069,15 +1069,17 @@
 	            				"The window matching the winid has no 3d viewport" );
 	            		
 	            		vd= (View3D *) sl;
-	            		vd->lay = layer;
+						if(vd->scenelock) {
+		            		vd->lay = layer;
 	            		
-	            		for(bit= 0; bit < 20; bit++) {
-	            			val = 1 << bit;
-	            			if( layer & val ) {
-	            				vd->layact = val;
-	            				 break;
-	            			}
-	            		}
+		            		for(bit= 0; bit < 20; bit++) {
+	    	        			val = 1 << bit;
+	        	    			if( layer & val ) {
+	            					vd->layact = val;
+	            					 break;
+	            				}
+		            		}
+						}
 	            		
 	            		winid = -1; /* so we know its done */
 	            		break;