Weird... I just patched gimp_xcf.py and I get the following:
Traceback (most recent call last):
File "gimp_xcf.py", line 206, in <module>
File "/usr/share/inkscape/extensions/inkex.py", line 215, in affect
File "gimp_xcf.py", line 194, in effect
x = open(xcf, 'rb')
IOError: [Errno 2] No such file or directory: '/tmp/tmp07Rs33/New docume.xcf'
Am I missing anything from the earlier 0.48.1 changes since the 0.48.0 release?