1) Launch TC
2) Draw a 3D object
3) Render it several times by applying different rendering types (wireframe, draft, quality, advanced)

Issue: A time will come when the object disappears. When pressing Ctrl+A, it reappears but in a wireframe mode. Zooming in and out doesn't have any effect over it. Sometimes the screen turns out black along with leaving different traces inside the drawing.

Solution: 

Since option Background render is enabled, the rendering is interrupted when a key or mouse button is pressed.
In this case, the render is interrupted before the sphere (see screenshot-1)

When selected (pressing Ctrl+A), rendering is interrupted and the 3D object with selector box is drawn on top of the image in wireframe mode.