At the moment all pages using GregTech-Nav are listed under that not so good sounding category: "Pages where template include size is exceeded" and are not showing the nav. Dunno, if thats a common problem though.
That is because the nav is so LARGE. Although if this now always happens when the nav is transculded, that wouldn't be a good thing... it might be possible to bump up that limit manually in the MW configuration, it would be up to RZR0 to decide and do that though.