Comment 9 for bug 902843

> I tried first on a MacOS X machine (…) (0.48.1 r9760 using X11)
> Then I installed the latest 0.48.2 on a Windows XP machine and
> the same problem occurred.

and

> It seems to be that problem with Lion (Bug #819209 you mentioned)

This doesn't really make sense to me yet: you originally reported that both on Mac OS X and on Windows, Inkscape failed to save the large file as 'Optimized SVG'.
- If you ran that initial test on OS X Lion ( as opposed to Snow Leopard), I would have expected that Inkscape returned the infamous error message "The fantastic lxml wrapper for libxml2 is required by inkex.py …" and aborted the save operation.
(You might have installed lxml for /usr/bin/python (Python 2.7) on your system, or used the egg-bot installer for the extensions (which forces Inkscape to use Python 2.5) ?)
- If it works with the scour script on OS X Lion on the command line, I wonder why it then failed on Windows XP…