diff --git a/src/java/com/threerings/parlor/card/client/CardGameController.java b/src/java/com/threerings/parlor/card/client/CardGameController.java
index 3b341c2f..32d12862 100644
--- a/src/java/com/threerings/parlor/card/client/CardGameController.java
+++ b/src/java/com/threerings/parlor/card/client/CardGameController.java
@@ -44,9 +44,8 @@ public abstract class CardGameController extends GameController
     {
         if (_ctx.getClient().getClientObject().receivers.containsKey(
                 CardGameDecoder.RECEIVER_CODE)) {
-            log.warning("Yuh oh, we already have a card game receiver " +
-                "registered and are trying for another...!");
-            Thread.dumpStack();
+            log.warning("Yuh oh, we already have a card game receiver registered and are trying " +
+                        "for another...!", new Exception());
         }
 
         _ctx.getClient().getInvocationDirector().registerReceiver(new CardGameDecoder(this));
diff --git a/src/java/com/threerings/parlor/game/server/GameManager.java b/src/java/com/threerings/parlor/game/server/GameManager.java
index 617d3106..2d6a4f4b 100644
--- a/src/java/com/threerings/parlor/game/server/GameManager.java
+++ b/src/java/com/threerings/parlor/game/server/GameManager.java
@@ -430,8 +430,8 @@ public class GameManager extends PlaceManager
     {
         // complain if we're already started
         if (_gameobj.state == GameObject.IN_PLAY) {
-            log.warning("Requested to start an already in-play game [game=" + where() + "].");
-            Thread.dumpStack();
+            log.warning("Requested to start an already in-play game", "game", where(),
+                        new Exception());
             return false;
         }
 
diff --git a/src/java/com/threerings/puzzle/client/PuzzleController.java b/src/java/com/threerings/puzzle/client/PuzzleController.java
index 2d6962c4..f6c2d516 100644
--- a/src/java/com/threerings/puzzle/client/PuzzleController.java
+++ b/src/java/com/threerings/puzzle/client/PuzzleController.java
@@ -397,21 +397,20 @@ public abstract class PuzzleController extends GameController
 
         // refuse to start the action if our puzzle view is hidden
         if (_pidx != -1 && !_panel.getBoardView().isShowing()) {
-            log.warning("Refusing to start action on hidden puzzle.");
-            Thread.dumpStack();
+            log.warning("Refusing to start action on hidden puzzle.", new Exception());
             return;
         }
 
         // refuse to start the action if it's already going
         if (_astate != ACTION_CLEARED) {
-            log.warning("Action state inappropriate for startAction()", "astate", _astate);
-            Thread.dumpStack();
+            log.warning("Action state inappropriate for startAction()", "astate", _astate,
+                        new Exception());
             return;
         }
 
         if (isChatting() && supportsActionPause()) {
-            log.info(
-                "Not starting action, player is chatting in a puzzle that supports pausing the action.");
+            log.info("Not starting action, player is chatting in a puzzle that supports " +
+                     "pausing the action.");
             return;
         }
 
diff --git a/src/java/com/threerings/puzzle/drop/client/DropBoardView.java b/src/java/com/threerings/puzzle/drop/client/DropBoardView.java
index 13494814..04339bad 100644
--- a/src/java/com/threerings/puzzle/drop/client/DropBoardView.java
+++ b/src/java/com/threerings/puzzle/drop/client/DropBoardView.java
@@ -138,8 +138,8 @@ public abstract class DropBoardView extends PuzzleBoardView
     public void createPiece (int piece, int sx, int sy)
     {
         if (sx < 0 || sy < 0 || sx >= _bwid || sy >= _bhei) {
-            log.warning("Requested to create piece in invalid location", "sx", sx, "sy", sy);
-            Thread.dumpStack();
+            log.warning("Requested to create piece in invalid location", "sx", sx, "sy", sy,
+                        new Exception());
             return;
         }
         createPiece(piece, sx, sy, sx, sy, 0L);
@@ -165,8 +165,8 @@ public abstract class DropBoardView extends PuzzleBoardView
     public void updatePiece (int piece, int sx, int sy)
     {
         if (sx < 0 || sy < 0 || sx >= _bwid || sy >= _bhei) {
-            log.warning("Requested to update piece in invalid location", "sx", sx, "sy", sy);
-            Thread.dumpStack();
+            log.warning("Requested to update piece in invalid location", "sx", sx, "sy", sy,
+                        new Exception());
             return;
         }
         int spos = sy * _bwid + sx;
@@ -186,8 +186,7 @@ public abstract class DropBoardView extends PuzzleBoardView
     {
         if (tx < 0 || ty < 0 || tx >= _bwid || ty >= _bhei) {
             log.warning("Requested to create and move piece to invalid location",
-                "tx", tx, "ty", ty);
-            Thread.dumpStack();
+                        "tx", tx, "ty", ty, new Exception());
             return;
         }
         Sprite sprite = createPieceSprite(piece, sx, sy);
diff --git a/src/java/com/threerings/stage/util/StageSceneUtil.java b/src/java/com/threerings/stage/util/StageSceneUtil.java
index c8e9e0a7..8a66f63c 100644
--- a/src/java/com/threerings/stage/util/StageSceneUtil.java
+++ b/src/java/com/threerings/stage/util/StageSceneUtil.java
@@ -270,8 +270,7 @@ public class StageSceneUtil
         double radius = (double)fwid/2;
         int clidx = cluster.width-2;
         if (clidx >= CLUSTER_METRICS.length/2 || clidx < 0) {
-            log.warning("Requested locs from invalid cluster " + cluster + ".");
-            Thread.dumpStack();
+            log.warning("Requested locs from invalid cluster " + cluster + ".", new Exception());
             return list;
         }