There is a new version of sci-astronomy/stellarium. The one in portage is 0.10.3 http://www.stellarium.org/ Regards Reproducible: Always Steps to Reproduce:
The release announcement indicates there were a number of problems with .10.3 (which probably should be removed from portage). The new release (.10.4) fixes those problems. I have never before seen them make a release less than a month after the prior release.
in portage. thanks for the bug report.