Hey had to fix a bunch of stuff to get it running with Unity 4, latest version of AstarPathfinding, and Orthello
1. in OT.cs had to set dirtyChecks to true at line 217
2. In MyGridGraph.cs had to change Vector3 npos1 and Vector3 npos2 to Pathfinding.Int3 npos1 and Pathfinding.Int3 npos2 at lines 212 and 213
3. Also in My MyGridGraph.cs, had to do a cast at line 84: node.position = new Int3(matrix.MultiplyPoint3x4 (new Vector3 (x+0.5F,0,y+0.5F)));
Hope this saves a few people some headaches. Runs the same as it did in the previous part for me now.
Realize this is a dated tutorial, but the bug fixing is actually beneficial for me anyway I figure.
Thanks!