Does Adobe know about bug with Luquify Filter and Fill Layers when they are shown as backdrop.
Especially (but not the rule) reproduced on high rez files, e.g. 5000x5000 or higer. When you try to show backdrop the solid color layer often you see transparency, or black, or white instead or real layer color.
This can be reproduced on ps cs2, cs3 and cs6 x32 and x64.