I tried Lasercut-jigsaw in Inkscape 0.48.4. It appeared to work normally. In a recent development build, rev 12851, I get the following crash. This is probably due to recent changes in the area of units management.
I would suggest that separate bug reports be created for both of these extensions, so that these issues can be discussed elsewhere more thoroughly.
Alvin
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Traceback (most recent call last):
File "Lasercut-jigsaw.py", line 879, in <module>
e.affect()
File "C:\InkscapeBZR\inkscape\share\extensions\inkex.py", line 245, in affect
self.effect()
File "Lasercut-jigsaw.py", line 798, in effect
docW = inkex.unittouu(self.document.getroot().get('width'))
AttributeError: 'module' object has no attribute 'unittouu'
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