It looks like the SCF calculation is having a hard time with the new potential. The input file you sent only has atoms out to 2.48 Ang (though perhaps you truncated it when posting???), but the SCF 4 0 30 0.2 1 in your feff.inp means to make a self-consistent potential out to 4 Ang. Without any atoms out that far, I can imagine it would have problems. I think you'll probably need a larger cluster than a single shell for a reasonable XANES simulation. Hope that helps, --Matt