diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 038090663..b821681a3 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -13707,6 +13707,17 @@
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>WarnFirstPhysicsWearable</key>
+    <map>
+      <key>Comment</key>
+      <string>Enables Physics Wearable warning dialog</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
     <key>WatchdogEnabled</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llagent.cpp b/indra/newview/llagent.cpp
index eb965d161..49dee2357 100644
--- a/indra/newview/llagent.cpp
+++ b/indra/newview/llagent.cpp
@@ -7733,7 +7733,8 @@ void LLAgent::sendAgentSetAppearance()
 	}
 
 
-	const bool wearing_physics = !!getWearable(WT_PHYSICS);
+	static bool send_physics_params = false;
+	send_physics_params |= !!getWearable(WT_PHYSICS);
 	S32 transmitted_params = 0;
 	for (LLViewerVisualParam* param = (LLViewerVisualParam*)mAvatarObject->getFirstVisualParam();
 		 param;
@@ -7741,17 +7742,17 @@ void LLAgent::sendAgentSetAppearance()
 	{
 		if (param->getGroup() == VISUAL_PARAM_GROUP_TWEAKABLE) // do not transmit params of group VISUAL_PARAM_GROUP_TWEAKABLE_NO_TRANSMIT
 		{
-			msg->nextBlockFast(_PREHASH_VisualParam );
-			
-			// We don't send the param ids.  Instead, we assume that the receiver has the same params in the same sequence.
-			const F32 param_value = param->getWeight();
-			const U8 new_weight = F32_to_U8(param_value, param->getMinWeight(), param->getMaxWeight());
-			msg->addU8Fast(_PREHASH_ParamValue, new_weight );
 			//A hack to prevent ruthing on older viewers when phys wearables aren't being worn.
-			if(!wearing_physics && param->getID() >= 10000)
+			if(!send_physics_params && param->getID() >= 10000)
 			{
 				break;
 			}
+			msg->nextBlockFast(_PREHASH_VisualParam );
+			// We don't send the param ids.  Instead, we assume that the receiver has the same params in the same sequence.
+			const F32 param_value = param->getWeight();
+			const U8 new_weight = F32_to_U8(param_value, param->getMinWeight(), param->getMaxWeight());
+
+			msg->addU8Fast(_PREHASH_ParamValue, new_weight );
 			transmitted_params++;
 		}
 	}
@@ -7892,6 +7893,30 @@ struct LLSetWearableData
 	LLWearable*			mNewWearable;
 };
 
+static bool isFirstPhysicsWearable(EWearableType type, LLInventoryItem *new_item, LLWearable *new_wearable)
+{
+	if (type == WT_PHYSICS && gSavedSettings.getWarning("FirstPhysicsWearable"))
+	{
+		class WearableDelayedCallback
+		{
+		public:
+			static void setDelayedWearable( const LLSD& notification, const LLSD& response, LLUUID item_id, LLWearable *wearable )
+			{
+				if(LLNotification::getSelectedOption(notification, response) == 0) //User selected wear
+				{
+					gSavedSettings.setWarning("FirstPhysicsWearable",FALSE);
+					LLInventoryItem *item = gInventory.getItem(item_id);
+					if(item)
+						gAgent.setWearable(item,wearable); //re-enter.
+				}
+			}
+		};
+		LLNotifications::instance().add("FirstPhysicsWearable",LLSD(),LLSD(),boost::bind(WearableDelayedCallback::setDelayedWearable, _1, _2, new_item->getUUID(),new_wearable));
+		return true;
+	}
+	return false;
+}
+
 BOOL LLAgent::needsReplacement(EWearableType  wearableType, S32 remove)
 {
 	return TRUE;
@@ -7961,6 +7986,11 @@ void LLAgent::setWearableOutfit(
 			}
 		}
 
+		if (isFirstPhysicsWearable(type, new_item, new_wearable))
+		{
+			return;
+		}
+
 		mWearableEntry[ type ].mItemID = new_item->getUUID();
 		mWearableEntry[ type ].mWearable = new_wearable;
 	}
@@ -8025,6 +8055,11 @@ void LLAgent::setWearable( LLInventoryItem* new_item, LLWearable* new_wearable )
 	}
 // [/RLVa:KB]
 
+	if (isFirstPhysicsWearable(type, new_item, new_wearable))
+	{
+		return;
+	}
+
 	if( old_wearable )
 	{
 		const LLUUID& old_item_id = mWearableEntry[ type ].mItemID;
diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index 38ae9202e..d9b80c9dc 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -1791,6 +1791,7 @@ bool LLAppViewer::initConfiguration()
 	LLFirstUse::addConfigVariable("FirstSculptedPrim");
 	LLFirstUse::addConfigVariable("FirstVoice");
 	LLFirstUse::addConfigVariable("FirstMedia");
+	LLFirstUse::addConfigVariable("FirstPhysicsWearable");
 	
 // [RLVa:KB] - Checked: RLVa-1.0.3a (2009-09-10) | Added: RLVa-1.0.3a
 	//LLFirstUse::addConfigVariable(RLV_SETTING_FIRSTUSE_DETACH);
diff --git a/indra/newview/skins/default/xui/en-us/notifications.xml b/indra/newview/skins/default/xui/en-us/notifications.xml
index 066eeee85..a6f57bbf3 100644
--- a/indra/newview/skins/default/xui/en-us/notifications.xml
+++ b/indra/newview/skins/default/xui/en-us/notifications.xml
@@ -6940,5 +6940,28 @@ No
   <notification icon="notifytip.tga" name="BlockedChatterAvatar" type="notifytip">Blocked chat-spam from avatar [FULL_NAME] ([SOURCE])</notification>
   <notification icon="notifytip.tga" name="BlockedChatterObjects" type="notifytip">Blocked chat-spam from objects owned by [OWNER] ([SOURCE])</notification>
 
+  <notification
+ icon="notify.tga"
+ name="FirstPhysicsWearable"
+ priority="high"
+ type="notify">
+By wearing a Physics Wearable certain server behavior will be enabled that many older viewers are incompatable with. On such viewers you may display incorrectly (often as 'Ruth').
+
+If you wish to keep compatability with old viewers then you must not wear a Physics Wearable during your session. If you have already worn one during this session remove it and reconnect.
+
+Click 'Wear' to attach the Physics Wearable, or click 'Cancel' if you wish to maintain compatability with legacy clients.
+    <unique/>
+    <form name="form">
+    <button
+     index="0"
+     name="Wear"
+     text="Wear"/>
+    <button
+     index="1"
+     name="Cancel"
+     text="Cancel"/>
+  </form>
+  </notification>
+
 </notifications>