Name: Rolf Mertig (email_not_shown)
Date: 05/02/11-06:43:18 PM Z

I just uploaded a new version of FeynCalc. It fixes your problem.
Please be careful: I have not tested this version very much.

rolfm@gluon:~$ math
Mathematica 8.0 for Linux x86 (64-bit)
Copyright 1988-2011 Wolfram Research, Inc.

In[1]:= <<HighEnergyPhysics`fc`
Loading FeynCalc from /home/rolfm/HighEnergyPhysics
FeynCalc 8.0.0.beta2 Type ?FeynCalc for help or visit
$PrePrint is set to FeynCalcForm. Use FI and FC to change the display format.
Loading FeynArts, see for documentation
FeynArts 3.4 patched for use with FeynCalc

In[2]:= FI; Tr[(GSD[p] + m).GAD[\[Mu]].(GSD[q] - m).GAD[\[Nu]]]

4*(-(m^2*Pair[LorentzIndex[\[Mu], D], LorentzIndex[\[Nu], D]]) +
  Pair[LorentzIndex[\[Mu], D], Momentum[q, D]]*Pair[LorentzIndex[\[Nu], D],
    Momentum[p, D]] + Pair[LorentzIndex[\[Mu], D], Momentum[p, D]]*
   Pair[LorentzIndex[\[Nu], D], Momentum[q, D]] -
  Pair[LorentzIndex[\[Mu], D], LorentzIndex[\[Nu], D]]*
   Pair[Momentum[p, D], Momentum[q, D]])

In[3]:= FCE@%

4*(FVD[p, \[Nu]]*FVD[q, \[Mu]] + FVD[p, \[Mu]]*FVD[q, \[Nu]] -
  m^2*MTD[\[Mu], \[Nu]] - MTD[\[Mu], \[Nu]]*SPD[p, q])

In[4]:= Tr[GA[a]]

Out[4]= 0

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