Here's my workflow:

- Base mesh created in Maya 2009
- Added high res detail + color map in Zbrush, created normal map from high res detail
- Exported normal map back into Maya, using original base mesh

The normal maps look all messed up in Maya, as you can see from the render. I have tried flipping the Green channel, reducing the bump depth and making sure that tangent space normal is checked and it still looks weird. Still can't figure out what is going on. Any ideas?