diff --git a/PepperDashEssentials/Bridges/EiscBridge.cs b/PepperDashEssentials/Bridges/EiscBridge.cs
index 984a1d9d..1a7ec02a 100644
--- a/PepperDashEssentials/Bridges/EiscBridge.cs
+++ b/PepperDashEssentials/Bridges/EiscBridge.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using Crestron.SimplSharp.Reflection;
 using Crestron.SimplSharpPro;
 using Crestron.SimplSharpPro.EthernetCommunication;
 using PepperDash.Core;
@@ -39,19 +40,31 @@ namespace PepperDash.Essentials.Bridges
                     if (device == null) continue;
 
                     Debug.Console(1, this, "Linking Device: '{0}'", device.Key);
-                    if (device is IBridge)      // Check for this first to allow bridges in plugins to override existing bridges that apply to the same type.
+                    if (typeof(IBridge).IsAssignableFrom(device.GetType().GetCType()))      // Check for this first to allow bridges in plugins to override existing bridges that apply to the same type.
                     {
                         Debug.Console(2, this, "'{0}' is IBridge", device.Key);
 
                         var dev = device as IBridge;
 
+                        if (dev == null)
+                        {
+                            Debug.Console(0, this, Debug.ErrorLogLevel.Error, "Cast to IBridge failed for {0}");
+                            continue;
+                        }
+
                         dev.LinkToApi(Eisc, d.JoinStart, d.JoinMapKey);
                     }
-                    if (!(device is IBridgeAdvanced)) continue;
+                    if (!typeof(IBridgeAdvanced).IsAssignableFrom(device.GetType().GetCType())) continue;
                     Debug.Console(2, this, "'{0}' is IBridgeAdvanced", device.Key);
 
                     var advDev = device as IBridgeAdvanced;
 
+                    if (advDev == null)
+                    {
+                        Debug.Console(0, this, Debug.ErrorLogLevel.Error, "Cast to IBridgeAdvanced failed for {0}");
+                        continue;
+                    }
+
                     try
                     {
                         advDev.LinkToApi(Eisc, d.JoinStart, d.JoinMapKey, null);
@@ -61,7 +74,6 @@ namespace PepperDash.Essentials.Bridges
                         Debug.ConsoleWithLog(0, this,
                             "Please update the bridge config to use EiscBridgeAdvanced with this device: {0}", device.Key);
                     }
-
                 }
                 Debug.Console(1, this, "Devices Linked.");
 
diff --git a/PepperDashEssentials/Bridges/IBridge.cs b/PepperDashEssentials/Bridges/IBridge.cs
index 8bc741ec..497985c7 100644
--- a/PepperDashEssentials/Bridges/IBridge.cs
+++ b/PepperDashEssentials/Bridges/IBridge.cs
@@ -1,4 +1,5 @@
 using System;
+using Crestron.SimplSharpPro.DeviceSupport;
 
 namespace PepperDash.Essentials.Bridges
 {
@@ -6,7 +7,8 @@ namespace PepperDash.Essentials.Bridges
     /// Defines a device that uses the legacy JoinMapBase for its join map
     /// </summary>
     [Obsolete("IBridgeAdvanced should be used going forward with JoinMapBaseAdvanced")]
-    public interface IBridge:Core.Bridges.IBridge
+    public interface IBridge
     {
+        void LinkToApi(BasicTriList trilist, uint joinStart, string joinMapKey);
     }
 }
\ No newline at end of file
diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/BridgeBase.cs b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/BridgeBase.cs
index 512401bc..0919335d 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/BridgeBase.cs	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/BridgeBase.cs	
@@ -7,7 +7,6 @@ using Crestron.SimplSharpPro.EthernetCommunication;
 using Newtonsoft.Json;
 
 using PepperDash.Core;
-using PepperDash.Essentials.Core;
 using PepperDash.Essentials.Core.Config;
 
 //using PepperDash.Essentials.Devices.Common.Cameras;
@@ -111,28 +110,17 @@ namespace PepperDash.Essentials.Core.Bridges
 
                     Debug.Console(1, this, "Linking Device: '{0}'", device.Key);
 
-                    if (typeof (IBridge).IsAssignableFrom(device.GetType().GetCType()))
+                    if (!typeof (IBridgeAdvanced).IsAssignableFrom(device.GetType().GetCType()))
                     {
-                        var basicBridge = device as IBridge;
-                        if (basicBridge != null)
-                        {
-                            Debug.Console(0, this, Debug.ErrorLogLevel.Notice,
-                                "Linking EiscApiAdvanced {0} to device {1} using obsolete join map. Please update the device's join map.",
-                                Key, device.Key);
-                            basicBridge.LinkToApi(Eisc, d.JoinStart, d.JoinMapKey);
-                        }
+                        Debug.Console(0, this, Debug.ErrorLogLevel.Notice,
+                            "{0} is not compatible with this bridge type. Please use 'eiscapi' instead, or updae the device.",
+                            device.Key);
                         continue;
                     }
 
-                    if (!typeof (IBridgeAdvanced).IsAssignableFrom(device.GetType().GetCType()))
-                    {
-                        continue;
-                    }
                     var bridge = device as IBridgeAdvanced;
                     if (bridge != null) bridge.LinkToApi(Eisc, d.JoinStart, d.JoinMapKey, this);
                 }
-
-                
             });
         }
 
@@ -303,7 +291,7 @@ namespace PepperDash.Essentials.Core.Bridges
     {
         public EiscApiAdvancedFactory()
         {
-            TypeNames = new List<string>() { "eiscapiadv", "eiscapiadvanced" };
+            TypeNames = new List<string> { "eiscapiadv", "eiscapiadvanced" };
         }
 
         public override EssentialsDevice BuildDevice(DeviceConfig dc)
diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/IBridge.cs b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/IBridge.cs
index 4aca333a..0c6b44ed 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/IBridge.cs	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Bridges/IBridge.cs	
@@ -1,19 +1,12 @@
-using System;
-using Crestron.SimplSharpPro.DeviceSupport;
-using PepperDash.Core;
+using Crestron.SimplSharpPro.DeviceSupport;
 
 namespace PepperDash.Essentials.Core.Bridges
 {
     /// <summary>
     /// Defines a device that uses JoinMapBaseAdvanced for its join map
     /// </summary>
-    public interface IBridgeAdvanced:IKeyed
+    public interface IBridgeAdvanced
     {
         void LinkToApi(BasicTriList trilist, uint joinStart, string joinMapKey, EiscApiAdvanced bridge);
     }
-
-    public interface IBridge:IKeyed
-    {
-        void LinkToApi(BasicTriList trilist, uint joinStart, string joinMapKey);
-    }   
 }
\ No newline at end of file
diff --git a/essentials-framework/pepperdashcore-builds b/essentials-framework/pepperdashcore-builds
index 974d2f47..18cb0c27 160000
--- a/essentials-framework/pepperdashcore-builds
+++ b/essentials-framework/pepperdashcore-builds
@@ -1 +1 @@
-Subproject commit 974d2f473c06b2c90b18c06e0f758ca47d466be8
+Subproject commit 18cb0c273eb8b750f657d74160ad82eff1b24bca