If you find a bug in the GPAW software, please report it to the developers so it can be fixed. We need that feedback from the community to maintain the quality of the code.
If you are unsure if it is a real bug, or a usage problem, it is probably best to report the problem on the
gpaw-usersmailing list (see Contact).
Please provide the failing script as well as the information about your environment (processor architecture, versions of Python and NumPy). Then we (or other users) can help you to find out if it is a bug.
Another advantage of reporting bugs on the mailing list: often other users will tell you how to work around the bug (until it is solved).
If you think it is a bug, you can also report it directly on our issue tracker. The advantage of reporting bugs here is that it is not forgotten (which may be a risk on the mailing list).
We do not guarantee to fix all bugs, but we will do our best.