OpenGL and dynamic light problems

I'm asking this here because I made a bunch of light actors for a level based on the strobe lights found in the repository here. Recently they have stopped working in the latest version of GZDoom. So I download the strobe lights again and looked in the test map and those lights aren't working either so I don't think it is something I have done. I can't see any problems with my settings in GZDoom either.

Is anyone else have problems with dynamic lights in GZDoom?

This is most propably a bug with the strobe lights. You might want to tell the author of the object if he is interested in fixing it.