diff --git a/DDCore/src/segmentations/HexGrid.cpp b/DDCore/src/segmentations/HexGrid.cpp
index 0e9224e52..5be6ea355 100644
--- a/DDCore/src/segmentations/HexGrid.cpp
+++ b/DDCore/src/segmentations/HexGrid.cpp
@@ -123,7 +123,7 @@ namespace dd4hep {
 	double a=positive_modulo(y/(std::sqrt(3)*_sideLength),1);
 	double b=positive_modulo(x/(3*_sideLength),1);
 	int ix = std::floor(x/(3*_sideLength/2.))+		
-	  (b<0.5)*(-abs(a-.5)<(b-.5)*3)+(b>0.5)*(abs(a-.5)-.5<(b-1)*3);
+	  (b<0.5)*(-std::abs(a-.5)<(b-.5)*3)+(b>0.5)*(std::abs(a-.5)-.5<(b-1)*3);
 	int iy=std::floor(y/(std::sqrt(3)*_sideLength/2.));
 	iy-=(ix+iy)&1;
 	
diff --git a/DDG4/python/DDSim/DD4hepSimulation.py b/DDG4/python/DDSim/DD4hepSimulation.py
index b0af0d847..ddc7b93a5 100644
--- a/DDG4/python/DDSim/DD4hepSimulation.py
+++ b/DDG4/python/DDSim/DD4hepSimulation.py
@@ -277,11 +277,13 @@ def getDetectorLists(self, detectorDescription):
         detType = sd.type()
         logger.info('getDetectorLists - found active detector %s type: %s', name, detType)
         if any(pat.lower() in detType.lower() for pat in self.action.trackerSDTypes):
+          logger.info('getDetectorLists - Identified %s as a tracker', name)
           trackers.append(det.name())
         elif any(pat.lower() in detType.lower() for pat in self.action.calorimeterSDTypes):
+          logger.info('getDetectorLists - Identified %s as a calorimeter', name)
           calos.append(det.name())
         else:
-          logger.warning('Unknown sensitive detector type: %s', detType)
+          logger.warning('getDetectorLists - Unknown sensitive detector type: %s', detType)
           unknown.append(det.name())
 
     return trackers, calos, unknown
@@ -464,13 +466,13 @@ def run(self):
     # get lists of trackers and calorimeters in detectorDescription
 
     trk, cal, unk = self.getDetectorLists(detectorDescription)
-
-    for detectors, function, defFilter, abort in [(trk, geant4.setupTracker, self.filter.tracker, False),
-                                                  (cal, geant4.setupCalorimeter, self.filter.calo, False),
-                                                  (unk, geant4.setupDetector, None, True),
-                                                  ]:
+    for detectors, function, defFilter, defAction, abort in \
+        [(trk, geant4.setupTracker, self.filter.tracker, self.action.tracker, False),
+         (cal, geant4.setupCalorimeter, self.filter.calo, self.action.calo, False),
+         (unk, geant4.setupDetector, None, "No Default", True),
+         ]:
       try:
-        self.__setupSensitiveDetectors(detectors, function, defFilter, abort)
+        self.__setupSensitiveDetectors(detectors, function, defFilter, defAction, abort)
       except Exception as e:
         logger.error("Failed setting up sensitive detector %s", e)
         raise
@@ -580,7 +582,7 @@ def __checkOutputLevel(self, level):
       return -1
 
   def __setupSensitiveDetectors(self, detectors, setupFunction, defaultFilter=None,
-                                abortForMissingAction=False,
+                                defaultAction=None, abortForMissingAction=False,
                                 ):
     """Attach sensitive detector actions for all subdetectors.
 
@@ -592,7 +594,7 @@ def __setupSensitiveDetectors(self, detectors, setupFunction, defaultFilter=None
     :param abortForMissingAction: if true end program if there is no action found
     """
     for det in detectors:
-      logger.info('Setting up SD for %s', det)
+      logger.info('Setting up SD for %s with %s', det, defaultAction)
       action = None
       for pattern in self.action.mapActions:
         if pattern.lower() in det.lower():
diff --git a/examples/CLICSiD/sim/field.xml b/examples/CLICSiD/sim/field.xml
index 6ac71a42d..daee5488b 100644
--- a/examples/CLICSiD/sim/field.xml
+++ b/examples/CLICSiD/sim/field.xml
@@ -24,7 +24,7 @@
 		delta_one_step="0.001*mm"
 		eps_min="5e-05*mm"
 		eps_max="0.001*mm"
-		stepper="HelixSimpleRunge"
+		stepper="ClassicalRK4"
 		equation="Mag_UsualEqRhs">
     </attributes>
   </properties>
diff --git a/examples/ClientTests/src/NestedBoxReflection_geo.cpp b/examples/ClientTests/src/NestedBoxReflection_geo.cpp
index e38b6b755..9c4e933f0 100644
--- a/examples/ClientTests/src/NestedBoxReflection_geo.cpp
+++ b/examples/ClientTests/src/NestedBoxReflection_geo.cpp
@@ -36,7 +36,7 @@ namespace   {
 
     constexpr double tol = 1.0e-3;       // Geant4 compatible
     double check = (x.Cross(y)).Dot(z);  // in case of a LEFT-handed orthogonal system this must be -1
-    if (abs(1. + check) > tol) {
+    if (std::abs(1. + check) > tol) {
       except("NestedBoxReflection", "+++ FAILED to construct Rotation is not LEFT-handed!");
     }
     printout(INFO, "NestedBoxReflection", "+++ Constructed LEFT-handed reflection rotation.");