"Clipping" / no materiel / no bit selected problem

Hello. Have tried to communicate by chat and email, but no respons :o(

I have uploaded a project with a sheet 122x244cm and I have “clipping” problems when I watch the 3D screen.
(It´s like in Sketchup sometimes, when you zoom in or are to close to the object)

Also I got the “no materiel selected” and sometimes “no bit” selected. But I HAVE selected both !

Any solution ?? or do I have to move on with Meshcam ;o)))