As someone found out, in line 1022 of gui/panels.py the line
gcdc.SetBrush(wx.Brush(wx.Color(0, 0, 255, 50))) # light blue
has to changed to
gcdc.SetBrush(wx.Brush(wx.Colour(0, 0, 255, 50))) # light blue
As someone found out, in line 1022 of gui/panels.py the line
gcdc.SetBrush( wx.Brush( wx.Color( 0, 0, 255, 50))) # light blue
has to changed to
gcdc.SetBrush( wx.Brush( wx.Colour( 0, 0, 255, 50))) # light blue