Reply To: I cannot see the cube in the solid mode, but I can see it in the shading and rendering modes. What is the problem?

[Dwayne Savage]

My first guess would be that you have the alpha set to 0 under the viewport display color setting.(Properties editor->material tab->viewport display panel)

My second guess would be display as set to none or bounding box.(Properties editor->object tab->viewport display panel)