Cura shows shadow but no model

[paulsroom 2]

When I load a particular model into Cura it shows the shadow of the model but no model to slice. The shadow is kind of like Peter Pan and detached in that it's as if there's a model there but it's so far off the print bed that you can only see the shadow. I've looked at the model in Meshmixer and although it's a very big size, it does show in all its detail. I've used the inspector in Meshmixer to confirm that it's okay to print and also moved it around - and even plane cut a section - but I can't get the model to show in Cura.

[ahoeben 1,948]

Please add a screenshot.

 

What version of Cura on what OS with what GPU do you use?

[paulsroom 2]

I was using Windows 7 on a laptop with an old version of Cura. I've tried the latest version of Cura with Windows 10 and the graphics card is Radeon RX Vega M GH  Graphics.

The file loads but it says it's non manifold and won't print.