The good folks at Team Archon have posted a notice concerning a plot-stopping bug in version 1.0 of the Ultima 6 Project:

Team Archon is currently working on a patch (1.0.1) to address some problems with the 1.0 release, one of which will prevent you from winning the game. This patch will be compatible with your saved games from 1.0, and therefore all players should download and apply it immediately once it is released. We need your help to make sure that all players get this patch, as they will eventually get blocked and be unable to proceed without it. The patch is nearing completion and should be available before too long.

If you are already blocked, we may be able to distribute an early, “experimental” build of the patch to those who would like to try it (at their own risk). Make sure you save your game before applying the patch. If you have questions about this, we recommend that you post them in our forum. We will be making an announcement here and on Project Britannia when the patch is publicly available.

Aiera will be hosting the patch when it releases; if you need/want it before then, follow the link above to the Project Britannia forum and let then know.