Another quick tip--if you have a Mach-II site and all your pages come up blank but you don't see any errors, chances are your mappings for your views are bad. The issue of course is if Mach-II can't find the views, it can't display the exception view either. Another quick response from Mossie on the fusebox.org Mach-II forum. Thanks!
Just FYI, this is bug 28646 in the Macromedia bugbase and Ben Edwards and I will be figuring out a solution to this in due course (perhaps for Mach II 2.0 if we don't make another release between 1.0.10 and Q1 2005).