last time we answered this question, OP was using IBL/AO with bad artifacts.  never said if he tried turning off AO in his IDL render.  OP may now have spotlites with AO enabled.

they might have caused less confusion if they stuck to calling it GI, instead of acronym IDL, which looks similar to acronym IBL for noobs.  but there was also confusion when GI was added to poser, as some thought it was somehow related to poser's implementation of IBL, hence it was six/one and 0.5 dozen of the other.