diff --git a/gviz.py b/gviz.py
index e2bd119..e919b71 100755
--- a/gviz.py
+++ b/gviz.py
@@ -47,13 +47,21 @@ class window(wx.Frame):
         else:
             event.Skip()
     
+
     def key(self, event):
         x=event.GetKeyCode()
+        if event.ShiftDown():
+            cx,cy=self.p.translate
+            if x==wx.WXK_UP:
+                self.p.zoom(cx,cy,1.2)
+            if x==wx.WXK_DOWN:
+                self.p.zoom(cx,cy,1/1.2)
+        else:
+            if x==wx.WXK_UP:
+                self.p.layerup()
+            if x==wx.WXK_DOWN:  
+                self.p.layerdown()
         #print x
-        if x==wx.WXK_UP:
-            self.p.layerup()
-        if x==wx.WXK_DOWN:
-            self.p.layerdown()
     
         #print p.lines.keys()
     def zoom(self, event):
diff --git a/printcore.py b/printcore.py
index fe8f8bf..c753c53 100755
--- a/printcore.py
+++ b/printcore.py
@@ -47,6 +47,7 @@ class printcore():
         self.endcb=None#impl ()
         self.onlinecb=None#impl ()
         self.loud=False#emit sent and received lines to terminal
+        self.greetings=['start','Grbl ']
         if port is not None and baud is not None:
             #print port, baud
             self.connect(port, baud)
@@ -115,10 +116,10 @@ class printcore():
                     print "RECV: ",line.rstrip()
             if(line.startswith('DEBUG_')):
                 continue
-            if(line.startswith('start') or line.startswith('ok')):
+            if(line.startswith(tuple(self.greetings)) or line.startswith('ok')):
                 self.clear=True
-            if(line.startswith('start') or line.startswith('ok') or "T:" in line):
-                if (not self.online or line.startswith('start')) and self.onlinecb is not None:
+            if(line.startswith(tuple(self.greetings)) or line.startswith('ok') or "T:" in line):
+                if (not self.online or line.startswith(tuple(self.greetings))) and self.onlinecb is not None:
                     try:
                         self.onlinecb()
                     except:
diff --git a/pronsole.py b/pronsole.py
index cc6c189..3179e56 100755
--- a/pronsole.py
+++ b/pronsole.py
@@ -274,7 +274,7 @@ class pronsole(cmd.Cmd):
         self.helpdict["temperature_pla"] = _("Extruder temp for PLA (default: 185 deg C)")
         self.helpdict["xy_feedrate"] = _("Feedrate for Control Panel Moves in X and Y (default: 3000mm/min)")
         self.helpdict["z_feedrate"] = _("Feedrate for Control Panel Moves in Z (default: 200mm/min)")
-
+        self.commandprefixes='MGT$'
     
     def set_temp_preset(self,key,value):
         if not key.startswith("bed"):
@@ -870,14 +870,14 @@ class pronsole(cmd.Cmd):
         print "! os.listdir('.')"
         
     def default(self,l):
-        if(l[0]=='M' or l[0]=="G" or l[0]=='T'):
+        if(l[0] in self.commandprefixes.upper()):
             if(self.p and self.p.online):
                 print "SENDING:"+l
                 self.p.send_now(l)
             else:
                 print "Printer is not online."
             return
-        if(l[0]=='m' or l[0]=="g" or l[0]=='t'):
+        elif(l[0] in self.commandprefixes.lower()):
             if(self.p and self.p.online):
                 print "SENDING:"+l.upper()
                 self.p.send_now(l.upper())
diff --git a/pronterface.py b/pronterface.py
index c29c79e..08c0ef2 100755
--- a/pronterface.py
+++ b/pronterface.py
@@ -1368,7 +1368,7 @@ class PronterWindow(wx.Frame,pronsole.pronsole):
             except:
                 pass
         dlg=wx.FileDialog(self,_("Open file to print"),basedir,style=wx.FD_OPEN|wx.FD_FILE_MUST_EXIST)
-        dlg.SetWildcard(_("OBJ, STL, and GCODE files (;*.gcode;*.gco;*.g;*.stl;*.STL;*.obj;*.OBJ;)"))
+	dlg.SetWildcard(_("OBJ, STL, and GCODE files (*.gcode;*.gco;*.g;*.stl;*.STL;*.obj;*.OBJ)|*.gcode;*.gco;*.g;*.stl;*.STL;*.obj;*.OBJ|All Files (*.*)|*.*"))
         if(filename is not None or dlg.ShowModal() == wx.ID_OK):
             if filename is not None:
                 name=filename