Light entities in Quark 6.5 Beta acting weird in TGE 1.5.1

If I do a total relight in Torque TGE 1.5.1 once I added a Quark DIF that contains light, sometimes those lights are acting realy weird: casting weird colors inside and/or outside of DIF. It does not happen all the time. It depends on the actual lights on how they are placed and their intensity (white simple lights).

Anyone know what's causing that ?

Should I stick with TGE's lights only ?