Color by glyph magnitude not available in v5.6
When creating a Glyph plot, the magnitude of the vector variable used to construct the plot is not available for coloring in v5.6 (64 bits Win). Previous versions (e.g. 5.5.2 64 bits Win), created a "GlyphVector" variable for coloring with the glyph vector magnitude. Paraview v5.6 is capable of reading a 5.5.2 version saved stated, and then it does find the GlyphVector variable and is able to color by that variable.
In the meantime, the calculator can be used to create a magnitude variable, and used that variable to color the glyphs, but v5.5.2 approach is better, as when choosing GlyphVector variable to color, the "Magnitude", "X", "Y", or "Z" components of the GlyphVector variable can be used to color.
I tried creating a dummy vector variable with the calculator, which is a copy of the original variable, and use that to color, but at least in the example that I tried, Paraview crashed when creating the Glyph plot using the calculator source defined.