Broken: 2.77 (second official beta release)
Short description of error
Blender crashes with 2 density texture materials,
For a link of the file to test it with, and some graphical display see the two posts here:
Exact steps for others to reproduce the error
the problem start as soon as i connect both point density textures to the mix shader connect, (to get some cloud variation).
Tried a similar setup where i used color mix node also hangs blender. trying to render or in viewport switch to renderview crashes.