3D solid not visible in 2D wireframe view

[bonominijl688916]

First post, sorry if this is not the correct section.

I'm using Autocad 2015 and I've also tried 2014 on a 2012 macbook pro. I created a simple 3d solid through extrusion and subtraction then inlayed some custom font and shapes into the top part of the solid then subtracted those as well, after doing this the 3d solid is not acting as expected.

If I switch to 2D wireframe view the object disappears, if I try to move it to another layer it disappears, if I zoom out too much or in too much it disappears.

I've tried copying the copy the object into another drawing and it says it's copied but the object is not visible.

I have tried the convtosolid command and receive the error "Object cannot be converted"
Trying to explode the object also does not work.

I've read that it may have become an anonymous block and the steps to solve it are to open the block editor however the object is not listed under that menu.

I've attached the drawing file below, opening it in autocad 2015 will not show the object but opening it in 2014 will.

Thanks for any help in advance.

[tedg]

I'm not sure what you were looking for, but I just opened the drawing and turned on the layers and everything appears to be right?
There were (3) copies of this model in the file but I zoomed in on one, set shademode to 2D wire frame on the left view, Shaded on right view.
Using vanilla AutoCAD 2013