Hi,
everything works fine with FC5.2 under Mathematica 5.2.
It might or might not work under Mathematica 4.x
Please upgrade to Mathematica 5.2.
In[2]:= $FeynCalcVersion
Out[2]= 5.2
In[3]:= ScalarProduct[p, p] = 0;
In[4]:= Tr[GAD[a].GSD[p].GAD[b].GSD[p]] //FCE //InputForm
Out[4]//InputForm= 8*FVD[p, a]*FVD[p, b]
--- Regards, Rolf
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