I caught myself unable to even determine possible reason for such fault. Plugin is compiled with python2.7. But even without that - package pygobject is built for all installed python versions due to requirements. When i try to just run python2 in term and import gobject, then just type "gobject" - it writes about gobject module, so it is really available. This bug is a probably different, but continuation of bug #643790 . It appeared after i tried solution, proposed in comments for question about bad magic number, happened for other package - just to find/remove all compiled files (i did it for *.pyc and *.pyo). Version 0.17.1 also affected - this is for #632464. Emerge info: should be same as in #643790, as nothing changed since that report.