diff --git a/src/p_3dfloors.cpp b/src/p_3dfloors.cpp
index 08050133a8..cec3b1c509 100644
--- a/src/p_3dfloors.cpp
+++ b/src/p_3dfloors.cpp
@@ -821,13 +821,6 @@ void P_LineOpening_XFloors (FLineOpening &open, AActor * thing, const line_t *li
 				open.floorpic = highestfloorpic;
 				open.floorterrain = highestfloorterrain;
 				open.bottomsec = highestfloorsec;
-			}
-			
-			if(lowestceiling < open.top) 
-			{
-				open.top = lowestceiling;
-				open.ceilingpic = lowestceilingpic;
-				open.topsec = lowestceilingsec;
 				if (highestfloorplanes[0])
 				{
 					open.frontfloorplane = *highestfloorplanes[0];
@@ -840,6 +833,13 @@ void P_LineOpening_XFloors (FLineOpening &open, AActor * thing, const line_t *li
 				}
 			}
 			
+			if(lowestceiling < open.top) 
+			{
+				open.top = lowestceiling;
+				open.ceilingpic = lowestceilingpic;
+				open.topsec = lowestceilingsec;
+			}
+			
 			open.lowfloor = MIN(lowestfloor[0], lowestfloor[1]);
 		}
     }
diff --git a/src/p_maputl.cpp b/src/p_maputl.cpp
index 60d94e4b45..1f32d6faa1 100644
--- a/src/p_maputl.cpp
+++ b/src/p_maputl.cpp
@@ -726,7 +726,7 @@ FMultiBlockLinesIterator::FMultiBlockLinesIterator(FPortalGroupArray &check, AAc
 {
 	checkpoint = origin->Pos();
 	if (!check.inited) P_CollectConnectedGroups(origin->Sector->PortalGroup, checkpoint, origin->Top(), checkradius, checklist);
-	checkpoint.z = checkradius;
+	checkpoint.z = checkradius == -1? origin->radius : checkradius;
 	basegroup = origin->Sector->PortalGroup;
 	Reset();
 }
@@ -801,7 +801,6 @@ bool FMultiBlockLinesIterator::Next(FMultiBlockLinesIterator::CheckResult *item)
 		item->line = line;
 		item->position.x = offset.x;
 		item->position.y = offset.y;
-		item->position.z = checkpoint.z;
 		item->portalflags = portalflags;
 		return true;
 	}
@@ -1059,7 +1058,7 @@ FMultiBlockThingsIterator::FMultiBlockThingsIterator(FPortalGroupArray &check, A
 {
 	checkpoint = origin->Pos();
 	if (!check.inited) P_CollectConnectedGroups(origin->Sector->PortalGroup, checkpoint, origin->Top(), checkradius, checklist);
-	checkpoint.z = checkradius;
+	checkpoint.z = checkradius == -1? origin->radius : checkradius;
 	basegroup = origin->Sector->PortalGroup;
 	Reset();
 }