If you open an instance of an abstraction, then Save
As... to somewhere else, the path of that abstraction
stays at the original location, even though the file
was saved to the new location. Clicking File->Save
will then save to the original location rather than the
Tested on Mac OS X with Pd-0.39.2,
Pd-0.39.2-extended-test5, and Pd-0.40-0.