Report Bugs in BBC Graphics Viewer
Here at NerdoftheHerd.com I use a utility called Bugzilla to manage bugs in my tools.
To report a bug in BBC Graphics Viewer, you need to create an account in my Bugzilla, and then all you need to do is to raise a new bug for the BBC Graphics Viewer product.
You might also like to search in Bugzilla to see if anyone else has already reported the error that you are going to report, to avoid duplication.