This is the content of the svg file:
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="800pt" height="600pt" viewBox="0 0 800 600" version="1.1">
<defs>
<clipPath id="clip0">
<rect width="800" height="600"/>
</clipPath>
</defs>
<g id="surface0" clip-path="url(#clip0)">
</g>
</svg>
Yes, cairo is installed, this is the output after loading pantograph:
Compiled with Python version 2.5.
Checking for installed Python... got it!
scene.getCurrentCamera() deprecated!
use scene.objects.camera instead
near:0.100000 far:100.000000 top:-0.033315 bottom:0.03331
0.044420 fovy:36.850757 aspect:1.333333
('Processing mesh Cube',)
scene.link(ob) deprecated!
use scene.objects.link(ob) instead
('Processing materials...',)
('Triangulating faces...',)
('Processing vertices...',)
('Processing edges...',)
('Processing 12 faces...',)
('Building mesh...',)
('Appending mesh to scene...',)
scene.unlink(ob) deprecated!
use scene.objects.unlink(ob) instead
('Writing materials to Pen Settings...',)
C:\Blender Foundation\blender-2.45-windows\blender.exe:13
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C:\Blender Foundation\blender-2.45-windows\blender.exe:14
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C:\Blender Foundation\blender-2.45-windows\blender.exe:14
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C:\Blender Foundation\blender-2.45-windows\blender.exe:15
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C:\Blender Foundation\blender-2.45-windows\blender.exe:16
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C:\Blender Foundation\blender-2.45-windows\blender.exe:17
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C:\Blender Foundation\blender-2.45-windows\blender.exe:18
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C:\Blender Foundation\blender-2.45-windows\blender.exe:18
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C:\Blender Foundation\blender-2.45-windows\blender.exe:19
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C:\Blender Foundation\blender-2.45-windows\blender.exe:21
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C:\Blender Foundation\blender-2.45-windows\blender.exe:21
lled_window_add(): cannot add non scrollable widget use g
with_viewport() instead
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('Setting up drawing...',)
('Faces to be sorted:', 12)
('8.33%',)
('***Inserting face 8 in the tree***',)
('Making new tree...',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('16.67%',)
('***Inserting face 5 in the tree***',)
('Comparing with Face 8',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('Face 5 is in back:',)
('25.0%',)
('***Inserting face 1 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('Face 1 is in back:',)
('33.33%',)
('***Inserting face 4 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Face 4 is coplanar:',)
('41.67%',)
('***Inserting face 10 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('Face 10 is in front:',)
('50.0%',)
('***Inserting face 2 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Comparing with Face 10',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('Face 2 is in front:',)
('58.33%',)
('***Inserting face 6 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Comparing with Face 10',)
('Comparing with Face 2',)
('Adding a new tree:', [<pantographLib.Face instance at 0
('Face 6 is in front:',)
('66.67%',)
('***Inserting face 9 in the tree***',)
('Comparing with Face 8',)
('Face 9 is coplanar:',)
('75.0%',)
('***Inserting face 7 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Comparing with Face 10',)
('Comparing with Face 2',)
('Comparing with Face 6',)
('Face 7 is coplanar:',)
('83.33%',)
('***Inserting face 0 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Face 0 is coplanar:',)
('91.67%',)
('***Inserting face 11 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Comparing with Face 10',)
('Face 11 is coplanar:',)
('100.0%',)
('***Inserting face 3 in the tree***',)
('Comparing with Face 8',)
('Comparing with Face 5',)
('Comparing with Face 1',)
('Comparing with Face 10',)
('Comparing with Face 2',)
('Face 3 is coplanar:',)
('Sorting took 0.001 minutes',)
When saving the console only says:
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
('Setting up drawing...',)
Yes everything else seems to work fine 
