Index: release/scripts/ui/properties_render.py
===================================================================
--- release/scripts/ui/properties_render.py	(revision 28453)
+++ release/scripts/ui/properties_render.py	(working copy)
@@ -314,7 +314,16 @@
         if rd.file_format in ('AVI_JPEG', 'JPEG'):
             split = layout.split()
             split.prop(rd, "file_quality", slider=True)
+        
+        elif rd.file_format == 'MULTILAYER':
+            split = layout.split()
 
+            col = split.column()
+            col.label(text="Codec:")
+            col.prop(rd, "exr_codec", text="")
+            if wide_ui:
+                col = split.column()
+
         elif rd.file_format == 'OPEN_EXR':
             split = layout.split()
 
Index: source/blender/render/intern/source/pipeline.c
===================================================================
--- source/blender/render/intern/source/pipeline.c	(revision 28453)
+++ source/blender/render/intern/source/pipeline.c	(working copy)
@@ -725,7 +725,8 @@
 	for(rlp= rrpart->layers.first; rlp; rlp= rlp->next) {
 		
 		if(rrpart->crop) {	/* filters add pixel extra */
-			offs= (rrpart->crop + rrpart->crop*rrpart->rectx);
+			//offs= (rrpart->crop + rrpart->crop*rrpart->rectx);
+			offs= rrpart->crop;
 		}
 		else {
 			offs= 0;
@@ -736,7 +737,7 @@
 			int a, xstride= 4;
 			for(a=0; a<xstride; a++)
 				IMB_exr_set_channel(rr->exrhandle, rlp->name, get_pass_name(SCE_PASS_COMBINED, a), 
-								xstride, xstride*rrpart->rectx, rlp->rectf+a + xstride*offs);
+									xstride, xstride*rrpart->rectx, rlp->rectf+a + xstride*offs);
 		}
 		
 		/* passes are allocated in sync */
Index: source/blender/imbuf/intern/openexr/openexr_api.cpp
===================================================================
--- source/blender/imbuf/intern/openexr/openexr_api.cpp	(revision 28453)
+++ source/blender/imbuf/intern/openexr/openexr_api.cpp	(working copy)
@@ -449,7 +449,7 @@
 	
 	openexr_header_compression(&header, compress);
 	/* header.lineOrder() = DECREASING_Y; this crashes in windows for file read! */
-	
+
 	header.insert ("BlenderMultiChannel", StringAttribute ("Blender V2.43 and newer"));
 	
 	data->ofile = new OutputFile(filename, header);
@@ -546,17 +546,36 @@
 	ExrChannel *echan;
 	
 	for(echan= (ExrChannel *)data->channels.first; echan; echan= echan->next) {
-		float *rect= echan->rect - echan->xstride*partx - echan->ystride*party;
+		/* OLD
+		float *rect= echan->rect - echan->xstride*partx - echan->ystride*party ;
+		
+		frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)rect, 
+							echan->xstride*sizeof(float), echan->ystride*sizeof(float)));
+		*/
 
+		/* coordinates for relative tile coordinates, starting from top of tile,
+		   striding left->right, top->bottom */
+		float *rect= echan->rect + (data->tiley)*echan->ystride;
+		int xs = echan->xstride*sizeof(float);
+		int ys = -echan->ystride*sizeof(float);
+		
 		frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)rect, 
-							echan->xstride*sizeof(float), echan->ystride*sizeof(float)));
+							xs, ys,			//xStride, yStride
+							1, 1, 0.0,		// xSampling, ySampling, fillValue
+							true, true) );	// xTileCoords, yTileCoords  (use relative tile coords)
 	}
 	
 	data->tofile->setFrameBuffer (frameBuffer);
 
 	try {
-		// printf("write tile %d %d\n", partx/data->tilex, party/data->tiley);
-		data->tofile->writeTile (partx/data->tilex, party/data->tiley, level);
+		int x, y;
+		x = partx/data->tilex;
+		/* y = party/data->tiley; // old */
+		
+		/* flip tile grid vertically to conform to EXR coordinate system */
+		y = ceil(data->height/data->tiley) - (party/data->tiley);
+
+		data->tofile->writeTile (x, y, level);
 	}
 	catch (const std::exception &exc) {
 		std::cerr << "OpenEXR-writeTile: ERROR: " << exc.what() << std::endl;
@@ -570,9 +589,12 @@
 	ExrChannel *echan;
 	
 	if(data->channels.first) {
-		for(echan= (ExrChannel *)data->channels.first; echan; echan= echan->next)
-			frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)echan->rect, 
-													echan->xstride*sizeof(float), echan->ystride*sizeof(float)));
+		for(echan= (ExrChannel *)data->channels.first; echan; echan= echan->next) {
+			float *rect = echan->rect + echan->xstride*(data->height-1)*data->width;
+			
+			frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)rect, 
+									echan->xstride*sizeof(float), -echan->ystride*sizeof(float)));
+		}
 		
 		data->ofile->setFrameBuffer (frameBuffer);
 		data->ofile->writePixels (data->height);	
@@ -591,8 +613,8 @@
 	for(echan= (ExrChannel *)data->channels.first; echan; echan= echan->next) {
 		/* no datawindow correction needed */
 		if(echan->rect)
-			frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)echan->rect, 
-												echan->xstride*sizeof(float), echan->ystride*sizeof(float)));
+			frameBuffer.insert (echan->name, Slice (FLOAT,  (char *)(echan->rect + echan->xstride*(data->height-1)*data->width), 
+												echan->xstride*sizeof(float), -echan->ystride*sizeof(float)));
 		else 
 			printf("warning, channel with no rect set %s\n", echan->name);
 	}