diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20d90fbe..a00b4103 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ CHANGELOG for FlatCAM beta
 
 =================================================
 
+27.01.2021
+
+- some fixes in Drilling Tool and in camlib.py file
+
 21.01.2021
 
 - added ability to see the verbose log when importing SVG's (if set in preferences)
diff --git a/appTools/ToolDrilling.py b/appTools/ToolDrilling.py
index 71c1eeed..06190814 100644
--- a/appTools/ToolDrilling.py
+++ b/appTools/ToolDrilling.py
@@ -306,19 +306,25 @@ class ToolDrilling(AppTool, Excellon):
         except Exception:
             pass
 
+        try:
+            loaded_obj = self.app.collection.get_by_name(self.ui.object_combo.get_value())
+        except Exception as err:
+            self.app.log.error("ToolDrilling -> Loaded Excellon object error. %s" % str(err))
+            return
+
         # reset the Excellon preprocessor combo
         self.ui.pp_excellon_name_cb.clear()
         # populate Excellon preprocessor combobox list
-        pp_list = []
-        for name in self.app.preprocessors.keys():
-            # the HPGL preprocessor or Paste_ are not for Excellon job therefore don't add it
-            if name in ['hpgl', 'Paste_1']:
-                continue
-            elif name == 'Check_points':
-                pp_list = [name]
-                break
-            pp_list.append(name)
-        pp_list.sort()
+        if loaded_obj.options['tools_drill_ppname_e'] == 'Check_points':
+            pp_list = ['Check_points']
+        else:
+            pp_list = []
+            for name in self.app.preprocessors.keys():
+                # the HPGL preprocessor or Paste_ are not for Excellon job therefore don't add it
+                if name in ['hpgl', 'Paste_1']:
+                    continue
+                pp_list.append(name)
+            pp_list.sort()
         if 'default' in pp_list:
             pp_list.remove('default')
             pp_list.insert(0, 'default')
@@ -330,12 +336,6 @@ class ToolDrilling(AppTool, Excellon):
 
         self.ui.order_radio.set_value(self.app.defaults["tools_drill_tool_order"])
 
-        try:
-            loaded_obj = self.app.collection.get_by_name(self.ui.object_combo.get_value())
-        except Exception as err:
-            self.app.log.error("ToolDrilling -> Loaded Excellon object error. %s" % str(err))
-            return
-
         if loaded_obj:
             outname = loaded_obj.options['name']
         else:
diff --git a/camlib.py b/camlib.py
index 7bcf6184..9f733e37 100644
--- a/camlib.py
+++ b/camlib.py
@@ -612,7 +612,7 @@ class Geometry(object):
             self.options['xmax'] = xmax
             self.options['ymax'] = ymax
         except Exception as e:
-            log.error("Failed. The object has no bounds properties. %s" % str(e))
+            self.app.log.error("Failed. The object has no bounds properties. %s" % str(e))
 
     def add_polygon(self, points, tool=None):
         """
@@ -653,7 +653,7 @@ class Geometry(object):
             self.options['xmax'] = xmax
             self.options['ymax'] = ymax
         except Exception as e:
-            log.error("Failed. The object has no bounds properties. %s" % str(e))
+            self.app.log.error("Failed. The object has no bounds properties. %s" % str(e))
 
     def add_polyline(self, points, tool=None):
         """
@@ -677,7 +677,7 @@ class Geometry(object):
             try:
                 self.solid_geometry = self.solid_geometry.union(new_line)
             except Exception as e:
-                log.error("Failed to run union on polylines. %s" % str(e))
+                self.app.log.error("Failed to run union on polylines. %s" % str(e))
                 return "fail"
 
         # add in tools solid_geometry
@@ -694,7 +694,7 @@ class Geometry(object):
             self.options['xmax'] = xmax
             self.options['ymax'] = ymax
         except Exception as e:
-            log.error("Failed. The object has no bounds properties. %s" % str(e))
+            self.app.log.error("Failed. The object has no bounds properties. %s" % str(e))
 
     def is_empty(self):
         if isinstance(self.solid_geometry, BaseGeometry) or isinstance(self.solid_geometry, Polygon) or \
@@ -732,7 +732,7 @@ class Geometry(object):
             if isinstance(target, LineString) or isinstance(target, LineString) or isinstance(target, MultiLineString):
                 diffs.append(target.difference(toolgeo))
             else:
-                log.warning("Not implemented.")
+                self.app.log.warning("Not implemented.")
 
         self.solid_geometry = unary_union(diffs)
 
@@ -746,10 +746,10 @@ class Geometry(object):
         # fixed issue of getting bounds only for one level lists of objects
         # now it can get bounds for nested lists of objects
 
-        log.debug("camlib.Geometry.bounds()")
+        self.app.log.debug("camlib.Geometry.bounds()")
 
         if self.solid_geometry is None:
-            log.debug("solid_geometry is None")
+            self.app.log.debug("solid_geometry is None")
             return 0, 0, 0, 0
 
         def bounds_rec(obj):
@@ -7558,7 +7558,7 @@ class CNCjob(Geometry):
         :rtype:             tuple
         """
 
-        log.debug("camlib.CNCJob.bounds()")
+        self.app.log.debug("camlib.CNCJob.bounds()")
 
         def bounds_rec(obj):
             if type(obj) is list:
@@ -7606,6 +7606,8 @@ class CNCjob(Geometry):
                     maxy = -np.Inf
                     try:
                         for geo in v['solid_geometry']:
+                            if isinstance(geo, list):
+                                geo = unary_union(geo)
                             if geo.is_empty:
                                 continue
                             minx_, miny_, maxx_, maxy_ = bounds_rec(geo)