diff --git a/Common/onelab.h b/Common/onelab.h
index 9bee45d83d010f46c15b7471c1d0a64d9a28df91..876173c2fd06018628903a89271c10b62677c790 100644
--- a/Common/onelab.h
+++ b/Common/onelab.h
@@ -162,7 +162,7 @@ namespace onelab{
     number(const std::string &name="", double value=0.,
            const std::string &shortHelp="", const std::string &help="") 
       : parameter(name, shortHelp, help), _value(value), 
-        _min(-maxNumber()), _max(maxNumber()), _step(0.) {}
+        _min(-maxNumber()), _max(maxNumber()), _step(1.) {}
     void setValue(double value){ _value = value; }
     void setMin(double min){ _min = min; }
     void setMax(double max){ _max = max; }
@@ -184,7 +184,7 @@ namespace onelab{
         setMin(p.getMin());
       if(p.getMax() != maxNumber())
         setMax(p.getMax());
-      if(p.getStep())
+      if(p.getStep() != 1.)
         setStep(p.getStep());
       if(p.getChoices().size())
         setChoices(p.getChoices());
diff --git a/Fltk/inputRange.h b/Fltk/inputRange.h
index 083c935772fbffc38ab8b69756359041840f78a7..29806d0586ad4ff83987afc77460bd2b2462357d 100644
--- a/Fltk/inputRange.h
+++ b/Fltk/inputRange.h
@@ -32,7 +32,7 @@ class inputRange : public Fl_Group {
       _input->maximum(_max);
     }
     if(_step){
-      tmp << ":" << _step;
+      if(_step != 1.) tmp << ":" << _step;
       _input->step(_step);
     }
     _range->value(tmp.str().c_str());
@@ -96,7 +96,7 @@ class inputRange : public Fl_Group {
   }
  public:
   inputRange(int x, int y, int w, int h, double max_number, const char *l=0) 
-    : Fl_Group(x,y,w,h,l), _min(-max_number), _max(max_number), _step(0),
+    : Fl_Group(x,y,w,h,l), _min(-max_number), _max(max_number), _step(1.),
       _max_number(max_number)
   {
     int dot_w = FL_NORMAL_SIZE - 2, loop_w = FL_NORMAL_SIZE + 6;
diff --git a/Fltk/onelabWindow.cpp b/Fltk/onelabWindow.cpp
index ef4b5fa1426b088a4de2c5d5b669328c7a1865f8..30cb5e2c251f1ca67ea7561aa0f576221376c3d1 100644
--- a/Fltk/onelabWindow.cpp
+++ b/Fltk/onelabWindow.cpp
@@ -320,6 +320,31 @@ static std::string getModelName(onelab::client *c)
   }
 }
 
+static bool shouldRecompute()
+{
+  bool recompute = false;
+  std::vector<onelab::number> numbers;
+  onelab::server::instance()->get(numbers);
+  for(unsigned int i = 0; i < numbers.size(); i++){
+    if(numbers[i].getAttribute("loop") == "true"){
+      if(numbers[i].getMax() != onelab::parameter::maxNumber() &&
+         numbers[i].getValue() < numbers[i].getMax() && 
+         numbers[i].getStep()){
+        numbers[i].setValue(numbers[i].getValue() + numbers[i].getStep());
+        onelab::server::instance()->set(numbers[i]);
+        Msg::Info("Recomputing with %s=%g", numbers[i].getName().c_str(),
+                  numbers[i].getValue());
+        recompute = true;
+      }
+    }
+  }
+
+  if(recompute)
+    FlGui::instance()->onelab->rebuildTree();
+  
+  return recompute;
+}
+
 void onelab_cb(Fl_Widget *w, void *data)
 {
   if(!data) return;
@@ -346,6 +371,8 @@ void onelab_cb(Fl_Widget *w, void *data)
 
   FlGui::instance()->onelab->deactivate();
   
+ recompute:
+
   // the Gmsh client is special: it always gets executed first. (The
   // meta-model will allow more flexibility: but in the simple GUI we
   // can assume this)
@@ -411,10 +438,11 @@ void onelab_cb(Fl_Widget *w, void *data)
     }
   }
 
-  FlGui::instance()->onelab->activate();
-
   printf("Gmsh ONELAB db:\n%s\n", onelab::server::instance()->toChar().c_str());
 
+  if(action == "compute" && shouldRecompute()) goto recompute;
+
+  FlGui::instance()->onelab->activate();
   FlGui::instance()->onelab->rebuildTree();
   FlGui::instance()->onelab->show();
 }
@@ -551,7 +579,7 @@ static std::string getShortName(const std::string &name)
 
 void onelabWindow::rebuildTree()
 {
-  int width = (3*IW)/2;
+  int width = (int)(1.4*IW);
 
   _tree->clear();
   _tree->sortorder(FL_TREE_SORT_ASCENDING);