diff --git a/Core/Algorithms/src/Simulation.cpp b/Core/Algorithms/src/Simulation.cpp
index 0f34eb1fb0daae7d7c9d563f650d1f600dee018e..59b77f89983b7c6aebbbd3ba1735aba03fcb850e 100644
--- a/Core/Algorithms/src/Simulation.cpp
+++ b/Core/Algorithms/src/Simulation.cpp
@@ -161,7 +161,7 @@ void Simulation::runSimulation()
     boost::scoped_ptr<ParameterPool > p_param_pool(createParameterTree());
     for (size_t index=0; index < param_combinations; ++index) {
         double weight = m_distribution_handler.setParameterValues(
-                p_param_pool, index);
+                p_param_pool.get(), index);
         updateSample();
         runSingleSimulation();
         m_intensity_map.scaleAll(weight);
diff --git a/GUI/coregui/Models/ParticleItem.cpp b/GUI/coregui/Models/ParticleItem.cpp
index ad175ea127215e0473cf1c7b1b342ad580c1f134..17143fe8ac9682158603c1cba422a4edea7ae94b 100644
--- a/GUI/coregui/Models/ParticleItem.cpp
+++ b/GUI/coregui/Models/ParticleItem.cpp
@@ -32,7 +32,7 @@ ParticleItem::ParticleItem(ParameterizedItem *parent)
     registerGroupProperty(P_FORM_FACTOR, Constants::FormFactorGroup);
     registerProperty(P_MATERIAL,
                      MaterialUtils::getDefaultMaterialProperty().getVariant());
-    registerProperty(P_DEPTH, 0.0);
+    registerProperty(P_DEPTH, 0.0, PropertyAttribute(AttLimits::limited(-10000.0, 10000.0), 2));
     registerProperty(P_ABUNDANCE, 1.0,
                      PropertyAttribute(AttLimits::limited(0.0, 1.0),3));
 
diff --git a/GUI/coregui/Views/JobWidgets/ModelTuningDelegate.cpp b/GUI/coregui/Views/JobWidgets/ModelTuningDelegate.cpp
index a559c24979eeb57f0b4d4d2b8134078c3bbc51f0..594701653063dc3360b89e3eb9f08408e68a7bc6 100644
--- a/GUI/coregui/Views/JobWidgets/ModelTuningDelegate.cpp
+++ b/GUI/coregui/Views/JobWidgets/ModelTuningDelegate.cpp
@@ -65,7 +65,7 @@ int ModelTuningDelegate::SliderData::value_to_slider(double value)
     if(value == 0.0) {
         dr = 1.0*m_range_factor/100.;
     } else {
-        dr = value*m_range_factor/100.;
+        dr = std::abs(value)*m_range_factor/100.;
     }
     m_rmin = value - dr;
     m_rmax = value + dr;