Clipping Border doesn't work sometimes I'm pretty new to Blender and I have created an environment. I import a vehicle model using the apend option but I have problems when trying to display only a portion of the car model. I press Alt+B and select the zone I want to cut, but for some reason Blender does weird things like making all objects disappear or cutting other zones. When I use the same tool in the project where i take the vehicle model from I don't have any trouble. What could be the origin of such issues?

Edit:

So this is my environment with the car model imported

I press CTRL + 1 to have the next view.

And I select an area with ALT + B. The result is this:





As you can see, everything disappears and I can't see the portion selected. There is another annoying thing. The vehicle surface is smooth in the original file, but when imported it is not like that anymore. Any ideas?
I think problem in clipping settings:



The end point is extremely big! Set end point less than one thousand.