  It is shown that the solution of the quark Dyson-Schwinger equation in QCD
obtained with a gluon propagator of the form $D(q) \sim q^2/[q^4+b^4]$ and a
quark-gluon vertex that is free of kinematic singularities does not describe a
confined particle and that there is always a value of $b^2 = b^2_c$ such that
chiral symmetry is not dynamically broken for $b^2>b_c^2$.
