No problem.
Yeah, the story of exporting in Recast is kinda complicated. First it wasn’t there at all. Then it was added, but I’m not sure if it ever worked well OOTB. Anyhow, given the pace of Recast/Detour development, that’s nothing strange. This stuff is great, but very experimental – even more then Bullet, I guess.
Remember, however, that you can also create navigation meshes by hand – for testing purposes that’s good enough. It would just be a major pain for real, large maps.