diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index 9403618..6c9d6f9 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -239,13 +239,13 @@ class App(QtCore.QObject):
         chars = 'abcdefghijklmnopqrstuvwxyz0123456789'
         if self.defaults['serial'] == 0 or len(str(self.defaults['serial'])) < 10:
             self.defaults['serial'] = ''.join([random.choice(chars) for i in range(20)])
-            self.save_defaults()
+            self.save_defaults(silent=True)
 
         self.propagate_defaults()
 
         def auto_save_defaults():
             try:
-                self.save_defaults()
+                self.save_defaults(silent=True)
             finally:
                 QtCore.QTimer.singleShot(self.defaults["defaults_save_period_ms"], auto_save_defaults)
 
@@ -819,7 +819,7 @@ class App(QtCore.QObject):
 
         self.save_defaults()
 
-    def save_defaults(self):
+    def save_defaults(self, silent=False):
         """
         Saves application default options
         ``self.defaults`` to defaults.json.
@@ -863,7 +863,8 @@ class App(QtCore.QObject):
             self.inform.emit("[error] Failed to write defaults to file.")
             return
 
-        self.inform.emit("Defaults saved.")
+        if not silent:
+            self.inform.emit("Defaults saved.")
 
     def on_edit_join(self):
         """
@@ -2327,9 +2328,11 @@ class App(QtCore.QObject):
         full_url = App.version_url + \
             "?s=" + str(self.defaults['serial']) + \
             "&v=" + str(self.version) + \
+            "&os=" + str(self.os) + \
             "&" + urllib.urlencode(self.defaults["stats"])
         App.log.debug("Checking for updates @ %s" % full_url)
 
+        ### Get the data
         try:
             f = urllib.urlopen(full_url)
         except:
@@ -2348,6 +2351,7 @@ class App(QtCore.QObject):
 
         f.close()
 
+        ### Latest version?
         if self.version >= data["version"]:
             App.log.debug("FlatCAM is up to date!")
             self.inform.emit("[success] FlatCAM is up to date!")
@@ -2356,9 +2360,10 @@ class App(QtCore.QObject):
         App.log.debug("Newer version available.")
         self.message.emit(
             "Newer Version Available",
-            "There is a newer version of FlatCAM\n" +
-            "available for download:\n\n" +
-            data["name"] + "\n\n" + data["message"],
+            QtCore.QString("There is a newer version of FlatCAM " +
+                           "available for download:<br><br>" +
+                           "<B>" + data["name"] + "</b><br>" +
+                           data["message"].replace("\n", "<br>")),
             "info"
         )
 
diff --git a/FlatCAMDraw.py b/FlatCAMDraw.py
index 5ad10ce..cd2648d 100644
--- a/FlatCAMDraw.py
+++ b/FlatCAMDraw.py
@@ -16,7 +16,14 @@ from mpl_toolkits.axes_grid.anchored_artists import AnchoredDrawingArea
 
 from rtree import index as rtindex
 
+
 class DrawTool(object):
+    """
+    Abstract Class representing a tool in the drawing
+    program. Can generate geometry, including temporary
+    utility geometry that is updated on user clicks
+    and mouse motion.
+    """
     def __init__(self, draw_app):
         self.draw_app = draw_app
         self.complete = False
@@ -40,6 +47,10 @@ class FCShapeTool(DrawTool):
 
 
 class FCCircle(FCShapeTool):
+    """
+    Resulting type: Polygon
+    """
+
     def __init__(self, draw_app):
         DrawTool.__init__(self, draw_app)
         self.start_msg = "Click on CENTER ..."
@@ -60,7 +71,7 @@ class FCCircle(FCShapeTool):
         if len(self.points) == 1:
             p1 = self.points[0]
             p2 = data
-            radius = sqrt((p1[0]-p2[0])**2 + (p1[1]-p2[1])**2)
+            radius = sqrt((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2)
             return Point(p1).buffer(radius)
 
         return None
@@ -68,12 +79,16 @@ class FCCircle(FCShapeTool):
     def make(self):
         p1 = self.points[0]
         p2 = self.points[1]
-        radius = sqrt((p1[0]-p2[0])**2 + (p1[1]-p2[1])**2)
+        radius = sqrt((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2)
         self.geometry = Point(p1).buffer(radius)
         self.complete = True
 
 
 class FCRectangle(FCShapeTool):
+    """
+    Resulting type: Polygon
+    """
+
     def __init__(self, draw_app):
         DrawTool.__init__(self, draw_app)
         self.start_msg = "Click on 1st corner ..."
@@ -107,6 +122,10 @@ class FCRectangle(FCShapeTool):
 
 
 class FCPolygon(FCShapeTool):
+    """
+    Resulting type: Polygon
+    """
+
     def __init__(self, draw_app):
         DrawTool.__init__(self, draw_app)
         self.start_msg = "Click on 1st point ..."
@@ -139,6 +158,10 @@ class FCPolygon(FCShapeTool):
 
 
 class FCPath(FCPolygon):
+    """
+    Resulting type: LineString
+    """
+
     def make(self):
         self.geometry = LineString(self.points)
         self.complete = True
@@ -166,10 +189,11 @@ class FCSelect(DrawTool):
             if self.draw_app.key != 'control':
                 shape["selected"] = False
 
-            distance = Point(point).distance(shape["geometry"])
-            if distance < min_distance:
+            # TODO: Do this with rtree?
+            dist = Point(point).distance(shape["geometry"])
+            if dist < min_distance:
                 closest_shape = shape
-                min_distance = distance
+                min_distance = dist
 
         if closest_shape is not None:
             closest_shape["selected"] = True
@@ -799,4 +823,4 @@ class FlatCAMDraw(QtCore.QObject):
 
 
 def distance(pt1, pt2):
-    return sqrt((pt1[0]-pt2[0])**2 + (pt1[1]-pt2[1])**2)
\ No newline at end of file
+    return sqrt((pt1[0] - pt2[0]) ** 2 + (pt1[1] - pt2[1]) ** 2)
\ No newline at end of file
diff --git a/ObjectUI.py b/ObjectUI.py
index 23a61b4..2a5bf6e 100644
--- a/ObjectUI.py
+++ b/ObjectUI.py
@@ -295,7 +295,9 @@ class GeometryObjectUI(ObjectUI):
         # Method
         methodlabel = QtGui.QLabel('Method:')
         methodlabel.setToolTip(
-            "Algorithm to paint the polygon."
+            "Algorithm to paint the polygon:<BR>"
+            "<B>Standard</B>: Fixed step inwards.<BR>"
+            "<B>Seed-based</B>: Outwards from seed."
         )
         grid2.addWidget(methodlabel, 3, 0)
         self.paintmethod_combo = RadioSet([
diff --git a/camlib.py b/camlib.py
index d2dddbc..712370f 100644
--- a/camlib.py
+++ b/camlib.py
@@ -125,19 +125,15 @@ class Geometry(object):
         log.debug("Geometry->bounds()")
         if self.solid_geometry is None:
             log.debug("solid_geometry is None")
-            log.warning("solid_geometry not computed yet.")
             return 0, 0, 0, 0
 
         if type(self.solid_geometry) is list:
-            log.debug("type(solid_geometry) is list")
             # TODO: This can be done faster. See comment from Shapely mailing lists.
             if len(self.solid_geometry) == 0:
                 log.debug('solid_geometry is empty []')
                 return 0, 0, 0, 0
-            log.debug('solid_geometry is not empty, returning cascaded union of items')
             return cascaded_union(self.solid_geometry).bounds
         else:
-            log.debug("type(solid_geometry) is not list, returning .bounds property")
             return self.solid_geometry.bounds
 
     def flatten_to_paths(self, geometry=None, reset=True):
diff --git a/defaults.json b/defaults.json
deleted file mode 100644
index 4c43f17..0000000
--- a/defaults.json
+++ /dev/null
@@ -1 +0,0 @@
-{"cncjob_append": "", "gerber_noncopperrounded": false, "geometry_paintoverlap": 0.15, "geometry_plot": true, "zoom_ratio": 1.5, "shell_at_startup": false, "gerber_isotooldia": 0.016, "serial": "32qac2m529hogh3lo33a", "shell_shape": [500, 300], "zoom_in_key": "3", "zoom_out_key": "2", "stats": {"save_defaults": 30}, "recent_limit": 10, "gerber_plot": true, "defaults_save_period_ms": 20000, "gerber_cutoutgapsize": 0.15, "geometry_feedrate": 3.0, "units": "IN", "excellon_travelz": 0.1, "gerber_multicolored": false, "gerber_solid": true, "gerber_isopasses": 1, "fit_key": "1", "excellon_plot": true, "excellon_feedrate": 3.0, "cncjob_tooldia": 0.016, "geometry_travelz": 0.1, "gerber_cutoutmargin": 0.1, "excellon_solid": false, "geometry_paintmargin": 0.0, "geometry_cutz": -0.002, "gerber_noncoppermargin": 0.0, "gerber_cutouttooldia": 0.07, "zdownrate": null, "gerber_gaps": "4", "last_folder": null, "gerber_bboxmargin": 0.0, "point_clipboard_format": "(%.4f, %.4f)", "cncjob_plot": true, "excellon_drillz": -0.1, "gerber_isooverlap": 0.15, "gerber_bboxrounded": false, "geometry_cnctooldia": 0.016, "geometry_painttooldia": 0.07}
\ No newline at end of file
diff --git a/recent.json b/recent.json
deleted file mode 100644
index 0637a08..0000000
--- a/recent.json
+++ /dev/null
@@ -1 +0,0 @@
-[]
\ No newline at end of file
diff --git a/setup_ubuntu.sh b/setup_ubuntu.sh
index 14e81ac..f531968 100644
--- a/setup_ubuntu.sh
+++ b/setup_ubuntu.sh
@@ -12,3 +12,5 @@ easy_install -U distribute
 apt-get install python-pip
 pip install --upgrade matplotlib
 pip install --upgrade Shapely
+apt-get install libspatialindex-dev
+pip install rtree