diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index 020ec593..872a6e4f 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -286,6 +286,8 @@ class App(QtCore.QObject):
             "cncjob_tooldia": 0.016,
             "cncjob_prepend": "",
             "cncjob_append": "",
+            "background_timeout": 300000, #default value is 5 minutes
+            "verbose_error_level": 0, # shell verbosity 0 = default(python trace only for unknown errors), 1 = show trace(show trace allways), 2 = (For the future).
 
             # Persistence
             "last_folder": None,
@@ -679,7 +681,6 @@ class App(QtCore.QObject):
         """
         this exception is deffined here, to be able catch it if we sucessfully handle all errors from shell command
         """
-
         pass
 
     def raise_tcl_unknown_error(self, unknownException):
@@ -704,14 +705,24 @@ class App(QtCore.QObject):
         """
 
         if isinstance(error, Exception):
+
             exc_type, exc_value, exc_traceback = error_info
-            trc=traceback.format_list(traceback.extract_tb(exc_traceback))
-            trc_formated=[]
-            for a in reversed(trc):
-                trc_formated.append(a.replace("    ", " > ").replace("\n",""))
-            text="%s\nPython traceback: %s\n%s" % (exc_value,
-                             exc_type,
-                             "\n".join(trc_formated))
+            if not isinstance(error, self.TclErrorException):
+                show_trace = 1
+            else:
+                show_trace = int(self.defaults['verbose_error_level'])
+
+            if show_trace > 0:
+                trc=traceback.format_list(traceback.extract_tb(exc_traceback))
+                trc_formated=[]
+                for a in reversed(trc):
+                    trc_formated.append(a.replace("    ", " > ").replace("\n",""))
+                text="%s\nPython traceback: %s\n%s" % (exc_value,
+                                 exc_type,
+                                 "\n".join(trc_formated))
+
+            else:
+                text="%s" % error
         else:
             text=error
 
diff --git a/tclCommands/TclCommand.py b/tclCommands/TclCommand.py
index bc7cd2c2..b93ec752 100644
--- a/tclCommands/TclCommand.py
+++ b/tclCommands/TclCommand.py
@@ -291,9 +291,6 @@ class TclCommandSignaled(TclCommand):
         it handles  all neccessary stuff about blocking and passing exeptions
     """
 
-    # default  timeout for operation is  300000 sec, but it can be much more
-    default_timeout = 300000
-
     output = None
 
     def execute_call(self, args, unnamed_args):
@@ -320,7 +317,7 @@ class TclCommandSignaled(TclCommand):
         """
 
         @contextmanager
-        def wait_signal(signal, timeout=10000):
+        def wait_signal(signal, timeout=300000):
             """Block loop until signal emitted, or timeout (ms) elapses."""
             loop = QtCore.QEventLoop()
 
@@ -357,10 +354,10 @@ class TclCommandSignaled(TclCommand):
             # Restore exception management
             sys.excepthook = oeh
             if ex:
-                self.raise_tcl_error(str(ex[0]))
+                raise ex[0]
 
             if status['timed_out']:
-                self.app.raise_tcl_unknown_error('Operation timed out!')
+                self.app.raise_tcl_unknown_error("Operation timed outed! Consider increasing option '-timeout <miliseconds>' for command or 'set_sys background_timeout <miliseconds>'.")
 
         try:
             self.log.debug("TCL command '%s' executed." % str(self.__class__))
@@ -370,7 +367,7 @@ class TclCommandSignaled(TclCommand):
                 passed_timeout=args['timeout']
                 del args['timeout']
             else:
-                passed_timeout=self.default_timeout
+                passed_timeout= self.app.defaults['background_timeout']
 
             # set detail for processing, it will be there until next open or close
             self.app.shell.open_proccessing(self.get_current_command())
@@ -378,8 +375,6 @@ class TclCommandSignaled(TclCommand):
             def handle_finished(obj):
                 self.app.shell_command_finished.disconnect(handle_finished)
                 if self.error is not None:
-                    self.log.error("TCL command '%s' failed." % str(self))
-                    self.app.display_tcl_error(self.error, self.error_info)
                     self.raise_tcl_unknown_error(self.error)
 
             self.app.shell_command_finished.connect(handle_finished)