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Hi, I followed a very similar process to also get the left arm solver. When running :

python `openrave-config --python-dir`/openravepy/_openravepy_/ikfast.py --robot=/home/vincent/nao/nao.dae --iktype=translationdirection5d --baselink=1 --eelink=35 --savefile=ikfast61_arm_hand_left.cpp

I get (some lines skipped)

[...]
INFO: ikfast translation direction 5d: [j8, j9, j10, j11, j12]
INFO: attempting li/woernle/hiller general ik method
INFO: special structure in equations detected, try to solve through elimination
INFO: [] [j8]
INFO: 'failed to find a variable to solve'
INFO: [] [j9]
INFO: 'failed to find a variable to solve'
INFO: try to solve first two variables pairwise
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/openravepy/_openravepy_/ikfast.py", line 6121, in <module>
[...]
  File "/usr/lib/python2.7/dist-packages/sympy/core/expr.py", line 129, in __float__
    raise ValueError("Symbolic value, can't compute")
ValueError: Symbolic value, can't compute

I also checked I have the correct version of sympy installed. Any idea what could be wrong ?