diff --git a/invesalius/constants.py b/invesalius/constants.py
index b56f5db..40b8ddb 100644
--- a/invesalius/constants.py
+++ b/invesalius/constants.py
@@ -189,7 +189,7 @@ VOLUME_POSITION = {AXIAL: [AXIAL_VOLUME_CAM_VIEW_UP, AXIAL_VOLUME_CAM_POSITION],
 # Mask threshold options
 proj = Project()
 THRESHOLD_RANGE = proj.threshold_modes[_("Bone")]
-THRESHOLD_PRESETS_INDEX = 0 #Bone
+THRESHOLD_PRESETS_INDEX = _("Bone")
 THRESHOLD_HUE_RANGE = (0, 0.6667)
 THRESHOLD_INVALUE = 5000
 THRESHOLD_OUTVALUE = 0
diff --git a/invesalius/gui/task_slice.py b/invesalius/gui/task_slice.py
index 5fa0943..0a860bf 100644
--- a/invesalius/gui/task_slice.py
+++ b/invesalius/gui/task_slice.py
@@ -474,6 +474,11 @@ class MaskProperties(wx.Panel):
             self.combo_thresh.SetSelection(default_thresh)
             (thresh_min, thresh_max) =\
                 self.threshold_modes[thresh_modes_names[default_thresh]]
+        elif default_thresh in proj.threshold_modes.keys():
+            index = self.threshold_modes_names.index(default_thresh)
+            self.combo_thresh.SetSelection(index)
+            thresh_min, thresh_max = self.threshold_modes[default_thresh]
+
         elif default_thresh in proj.threshold_modes.values():
             preset_name = proj.threshold_modes.get_key(default_thresh)[0]
             index = self.threshold_modes_names.index(preset_name) 
diff --git a/invesalius/gui/widgets/gradient.py b/invesalius/gui/widgets/gradient.py
index 881e675..9be0696 100755
--- a/invesalius/gui/widgets/gradient.py
+++ b/invesalius/gui/widgets/gradient.py
@@ -440,20 +440,22 @@ class GradientCtrl(wx.Panel):
             value = self.min_range
 
     def SetMaxValue(self, value):
-        value = int(value)
-        if value > self.max_range:
-            value = int(self.max_range)
-        self.spin_max.SetValue(value)
-        self.gradient_slider.SetMaximun(value)
-        self.maximun = value
+        if value:
+            value = int(value)
+            if value > self.max_range:
+                value = int(self.max_range)
+            self.spin_max.SetValue(value)
+            self.gradient_slider.SetMaximun(value)
+            self.maximun = value
 
     def SetMinValue(self, value):
-        value = int(value)
-        if value < self.min_range:
-            value = int(self.min_range)
-        self.spin_min.SetValue(value)
-        self.gradient_slider.SetMinimun(value)
-        self.minimun = value
+        if value:
+            value = int(value)
+            if value < self.min_range:
+                value = int(self.min_range)
+            self.spin_min.SetValue(value)
+            self.gradient_slider.SetMinimun(value)
+            self.minimun = value
 
     def ChangeMinValue(self, e):
         # Why do I need to change slide min value if it has been changed for
--
libgit2 0.21.2