I have Ubuntu 12.04 and Inkscape 0.48+devel r12347

Two weeks ago I installed the nightly build from Inkscape, 
then decided against it and 
uninstalled/reinstalled Inkscape from Ubuntu software center.

Since then the outset/inset function has generated incorrect results
for some shapes.

Here's a link to a file which demonstrates this problem:
https://docs.google.com/file/d/0BxsnjDIHW4yvRGRhYkVEa0E2UVk/edit?usp=sharing
Is this a bug or has my current installation gone awry?

Thanks for any feedback on this issue!

- Susan