I think it might help to a) create a bug in bugzilla with a link to Navigation, and a screenshot of the problem, and a recipe to reproduce b) think about how to implement a conformance test. Even a simple one might help.
These suggestions were already made back in http://www.winehq.org/pipermail/wine-devel/2007-January/053457.html - Dan -- Wine for Windows ISVs: http://kegel.com/wine/isv
