XSI and UDK - lightmass issues

Graft

Right now i'm working on a job that involves UDK and the modeling program I use is XSI. The problem is that i'm getting lighting seams along the uv borders of my models. I'm pretty sure it has to do with smoothing groups as they only appear with normal maps applied.

I was wondering if anyone has used XSI and UDK together and come up with a good solution or workaround to avoid this issue?

Froyok

Did you flip the green channel of your normal map before importing it in UDK ?
I use XSI too, and I don't think the problem is directly from XSI...