diff --git a/CHANGELOG b/CHANGELOG
index dcc21eb5..15ce1536 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -48,6 +48,11 @@ pyqtgraph-0.9.9  [unreleased]
     - PlotCurveItem ignores clip-to-view when auto range is enabled
     - FillBetweenItem now forces PlotCurveItem to generate path
     - Fixed import errors and py3 issues in MultiPlotWidget
+    - Isosurface works for arrays with shapes > 255
+    - Fixed ImageItem exception building histogram when image has only one value
+    - Fixed MeshData exception caused when vertexes have no matching faces
+    - Fixed GLViewWidget exception handler
+
 
 pyqtgraph-0.9.8  2013-11-24
 
diff --git a/pyqtgraph/functions.py b/pyqtgraph/functions.py
index db01b6b9..99c45606 100644
--- a/pyqtgraph/functions.py
+++ b/pyqtgraph/functions.py
@@ -1790,7 +1790,7 @@ def isosurface(data, level):
             [1, 1, 0, 2],
             [0, 1, 0, 2],
             #[9, 9, 9, 9]  ## fake
-        ], dtype=np.ubyte)
+        ], dtype=np.uint16) # don't use ubyte here! This value gets added to cell index later; will need the extra precision.
         nTableFaces = np.array([len(f)/3 for f in triTable], dtype=np.ubyte)
         faceShiftTables = [None]
         for i in range(1,6):
@@ -1889,7 +1889,6 @@ def isosurface(data, level):
         #profiler()
         if cells.shape[0] == 0:
             continue
-        #cellInds = index[(cells*ins[np.newaxis,:]).sum(axis=1)]
         cellInds = index[cells[:,0], cells[:,1], cells[:,2]]   ## index values of cells to process for this round
         #profiler()
         
@@ -1901,9 +1900,7 @@ def isosurface(data, level):
         #profiler()
         
         ### expensive:
-        #print verts.shape
         verts = (verts * cs[np.newaxis, np.newaxis, :]).sum(axis=2)
-        #vertInds = cutEdges[verts[...,0], verts[...,1], verts[...,2], verts[...,3]]  ## and these are the vertex indexes we want.
         vertInds = cutEdges[verts]
         #profiler()
         nv = vertInds.shape[0]
diff --git a/pyqtgraph/graphicsItems/ImageItem.py b/pyqtgraph/graphicsItems/ImageItem.py
index 7c80859d..6da8aedc 100644
--- a/pyqtgraph/graphicsItems/ImageItem.py
+++ b/pyqtgraph/graphicsItems/ImageItem.py
@@ -322,6 +322,8 @@ class ImageItem(GraphicsObject):
                 mx = stepData.max()
                 step = np.ceil((mx-mn) / 500.)
                 bins = np.arange(mn, mx+1.01*step, step, dtype=np.int)
+                if len(bins) == 0:
+                    bins = [mn, mx]
             else:
                 bins = 500
 
diff --git a/pyqtgraph/opengl/GLViewWidget.py b/pyqtgraph/opengl/GLViewWidget.py
index d74a13ce..0516bf08 100644
--- a/pyqtgraph/opengl/GLViewWidget.py
+++ b/pyqtgraph/opengl/GLViewWidget.py
@@ -180,7 +180,7 @@ class GLViewWidget(QtOpenGL.QGLWidget):
                     i.paint()
                 except:
                     from .. import debug
-                    pyqtgraph.debug.printExc()
+                    debug.printExc()
                     msg = "Error while drawing item %s." % str(item)
                     ver = glGetString(GL_VERSION)
                     if ver is not None:
diff --git a/pyqtgraph/opengl/MeshData.py b/pyqtgraph/opengl/MeshData.py
index 3046459d..e6888c16 100644
--- a/pyqtgraph/opengl/MeshData.py
+++ b/pyqtgraph/opengl/MeshData.py
@@ -266,7 +266,11 @@ class MeshData(object):
             vertFaces = self.vertexFaces()
             self._vertexNormals = np.empty(self._vertexes.shape, dtype=float)
             for vindex in xrange(self._vertexes.shape[0]):
-                norms = faceNorms[vertFaces[vindex]]  ## get all face normals
+                faces = vertFaces[vindex]
+                if len(faces) == 0:
+                    self._vertexNormals[vindex] = (0,0,0)
+                    continue
+                norms = faceNorms[faces]  ## get all face normals
                 norm = norms.sum(axis=0)       ## sum normals
                 norm /= (norm**2).sum()**0.5  ## and re-normalize
                 self._vertexNormals[vindex] = norm
@@ -403,12 +407,10 @@ class MeshData(object):
         Return list mapping each vertex index to a list of face indexes that use the vertex.
         """
         if self._vertexFaces is None:
-            self._vertexFaces = [None] * len(self.vertexes())
+            self._vertexFaces = [[] for i in xrange(len(self.vertexes()))]
             for i in xrange(self._faces.shape[0]):
                 face = self._faces[i]
                 for ind in face:
-                    if self._vertexFaces[ind] is None:
-                        self._vertexFaces[ind] = []  ## need a unique/empty list to fill
                     self._vertexFaces[ind].append(i)
         return self._vertexFaces