Comment on: Non-perturbative finite T broadening of the rho meson and   dilepton emission in heavy ion-collisions (by J. Ruppert and T. Renk Phys.   Rev. C71 (2005) 064903; nucl-th/0412047
  In this comment we point out several problems concerning kinematical singularities which are encountered in the calculation of the dilepton rates in {Ruppert:2004yg}. We also comment on the method introduced in {vanHees:2000bp} and further used in refs. {Riek:2004kx,Renk:2006dt,Renk:2006ax,Ruppert:2004yg} 
Felix Riek, Hendrik van Hees and J\"orn Knoll