diff --git a/xLights/effects/MovingHeadPanels/MovingHeadDimmerPanel.cpp b/xLights/effects/MovingHeadPanels/MovingHeadDimmerPanel.cpp
index 2d4e155e2..458cdbbf0 100755
--- a/xLights/effects/MovingHeadPanels/MovingHeadDimmerPanel.cpp
+++ b/xLights/effects/MovingHeadPanels/MovingHeadDimmerPanel.cpp
@@ -25,6 +25,7 @@ namespace
     const float hline_gap = 1.0f / num_hlines;
     const float vline_gap = 1.0f / num_vlines;
     const float marker_length = 0.04f;
+    const float pt_tol = 0.001f;  // can't let points be too close or Value Curve deletes them
 }
 
 BEGIN_EVENT_TABLE(MovingHeadDimmerPanel, wxPanel)
@@ -273,8 +274,12 @@ void MovingHeadDimmerPanel::OnMovingHeadMouseMove(wxMouseEvent& event)
                 // check if inside surrounding handles
                 if (active_handle != 0 &&
                     active_handle != m_handles.size()-1) {
-                    if (m_mousePos.m_x < m_handles[active_handle+1].m_x &&
-                        m_mousePos.m_x > m_handles[active_handle-1].m_x) {
+                    if (m_mousePos.m_x < m_handles[active_handle-1].m_x + pt_tol) {
+                        m_handles[active_handle].m_x = m_handles[active_handle-1].m_x + pt_tol;
+                    }
+                    else if (m_mousePos.m_x > m_handles[active_handle+1].m_x - pt_tol) {
+                        m_handles[active_handle].m_x = m_handles[active_handle+1].m_x - pt_tol;
+                    } else {
                         m_handles[active_handle].m_x = m_mousePos.m_x;
                     }
                 }
diff --git a/xLights/models/DMX/DmxMovingHead.cpp b/xLights/models/DMX/DmxMovingHead.cpp
index 9109c954e..c0bbd1c6f 100644
--- a/xLights/models/DMX/DmxMovingHead.cpp
+++ b/xLights/models/DMX/DmxMovingHead.cpp
@@ -540,7 +540,8 @@ void DmxMovingHead::DrawModel(ModelPreview* preview, xlGraphicsContext* ctx, xlG
     size_t NodeCount = Nodes.size();
     if ((( nullptr != color_ability ) && !color_ability->IsValidModelSettings(this)) ||
         !preset_ability->IsValidModelSettings(this) ||
-        shutter_channel > NodeCount)
+        shutter_channel > NodeCount ||
+        dimmer_channel > NodeCount )
     {
         DmxModel::DrawInvalid(sprogram, &(GetModelScreenLocation()), false, false);
         return;
@@ -563,6 +564,16 @@ void DmxMovingHead::DrawModel(ModelPreview* preview, xlGraphicsContext* ctx, xlG
 
     xlColor beam_color = color_ability->GetBeamColor(Nodes);
 
+    // apply dimmer to beam
+    if (dimmer_channel > 0 && active) {
+        xlColor proxy;
+        Nodes[dimmer_channel - 1]->GetColor(proxy);
+        HSVValue hsv = proxy.asHSV();
+        beam_color.red = (beam_color.red * hsv.value);
+        beam_color.blue = (beam_color.blue * hsv.value);
+        beam_color.green = (beam_color.green * hsv.value);
+    }
+
     if (!active) {
         beam_color = xlWHITE;
     } else {
diff --git a/xLights/models/DMX/DmxMovingHeadAdv.cpp b/xLights/models/DMX/DmxMovingHeadAdv.cpp
index 60e082826..d6d48e191 100644
--- a/xLights/models/DMX/DmxMovingHeadAdv.cpp
+++ b/xLights/models/DMX/DmxMovingHeadAdv.cpp
@@ -827,7 +827,8 @@ void DmxMovingHeadAdv::DrawModel(ModelPreview* preview, xlGraphicsContext* ctx,
     size_t NodeCount = Nodes.size();
     if ((( nullptr != color_ability ) && !color_ability->IsValidModelSettings(this)) ||
         !preset_ability->IsValidModelSettings(this) ||
-        shutter_channel > NodeCount)
+        shutter_channel > NodeCount ||
+        dimmer_channel > NodeCount)
     {
         DmxModel::DrawInvalid(sprogram, &(GetModelScreenLocation()), false, false);
         return;
@@ -953,6 +954,17 @@ void DmxMovingHeadAdv::DrawModel(ModelPreview* preview, xlGraphicsContext* ctx,
     if (!active) {
         beam_color = xlWHITE;
     }
+
+    // apply dimmer to beam
+    if (dimmer_channel > 0 && active) {
+        xlColor proxy;
+        Nodes[dimmer_channel - 1]->GetColor(proxy);
+        HSVValue hsv = proxy.asHSV();
+        beam_color.red = (beam_color.red * hsv.value);
+        beam_color.blue = (beam_color.blue * hsv.value);
+        beam_color.green = (beam_color.green * hsv.value);
+    }
+
     ApplyTransparency(beam_color, trans, trans);
 
     pan_angle_raw += beam_orient;