diff --git a/CHANGELOG.md b/CHANGELOG.md
index 386ee004..0ed09f7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ CHANGELOG for FlatCAM beta
 6.01.2022
 
 - modified the 'laser-lines' method in the Paint Plugin such that the rounded part of a painted trace is painted too in the case that the trace width is much higher than the clearing tool diameter
+- some changes in the Excellon object suggessted by an user: Karl-Heinz
 
 5.01.2022
 
diff --git a/appObjects/FlatCAMExcellon.py b/appObjects/FlatCAMExcellon.py
index 844c5af1..820691fb 100644
--- a/appObjects/FlatCAMExcellon.py
+++ b/appObjects/FlatCAMExcellon.py
@@ -1178,12 +1178,18 @@ class ExcellonObject(FlatCAMObj, Excellon):
         for tool_key in self.tools:
             # find the geo_plugin_table row associated with the tool_key
             for row in range(self.ui.tools_table.rowCount()):
-                tool_item = int(self.ui.tools_table.item(row, 0).text())
+                tool_item = int(float(self.ui.tools_table.item(row, 0).text()))
                 if tool_item == int(tool_key):
                     check_row = row
                     break
             state = self.ui.tools_table.cellWidget(check_row, 5).isChecked()
-            self.shapes.update_visibility(state, indexes=self.shape_indexes_dict[tool_key])
+            try:
+                # suggested by an user that may fix issues when run in Linux
+                # I don't see the reason for the .copy() but ...
+                #TODO may need removal of the .copy() method if the reason is not found
+                self.shapes.update_visibility(state, indexes=self.shape_indexes_dict[tool_key]).copy()
+            except Exception:
+                pass
         self.shapes.redraw()
         self.ui_connect()