Gnome mlview has version 0.7.1 now. This version isn't any more stable than the previous one. When will we have a good XML editor? The old ebuild file was usable for me, I've just stripped the gcc patch from my test ebuid.
An ebuild for mlview 0.7.1 is now in the tree. If you have found bugs within the software, it's always a good idea to issue a report to us and/or the upstream developers. Thanks.