I don't know what happens exactly and why but it appears you left uv6 undefined in the warp shader but then use it in the next line:
warp_35=`mus = abs(0.012/(sqrt(uv6.x)+0.0009))*(rad+0.19);
Uninitialised variables can produce all sorts of unexpected effects.
EDIT: I get the exactly same white screen in my original crystal palace preset if I delete the line where uv6 is defined.
