The nightly build is not safe for me. The supposed fix in alc_lightclasses caused my age to go bad. I reverted that file and the stripes are gone and fps is back to normal.
My waves however are now missing. Everything is set the same as before when it worked. And yes, shadbuf was already turned off for the waveset object (it is mentioned in the tutorial).
Edit: Wait a minute... object shadows? I thought that was impossible in the Plasma engine. Now I am really confused.