I have followed along on a few tutorials on Youtube where a temporary material is created and a basic diffuse colour chosen just to separate the piece from the rest to make modelling easier. In the Materials data section under settings tab the colour is also changed so you can see it in the 3D viewport as you model using solid shading.
When I do this the different colours do not show up in solid shading, only in material shading mode. Everything renders OK, it`s just this setting in solid mode. I checked on the video to make sure Blender was not in material shading mode and it was just me but it is in solid.
Is there a particular setting that might need adjusting to make Blender display the colours properly? I am using Blender version 2.78c and the Cycles Render.