Hey,

I just realized that there is an official support forum here, so I though I would post about this problem here as well.

Navmesh generation seems to be broken in the December build's PC editor. In the mobile editor it works. After building the paths, the log contains errors about "pylons not being aligned to the grid".

More info in this thread: http://forums.epicgames.com/showthread.php?t=754823

Thank you.