Since 1.2.8 zoom in 2D view was modified to center around the mouse location, like it was earlyer on 3D-view panel too.

But now on 1.3.0 the zoom happens at 0,0 coordinates at distance to the objekt
So i fiddeled around and found how it is going now.

You need to move the 3d-view angle with the right mousekey pressed until you centered your object in the window.
Now you can zoom close zu see your extrusion path instead of empty bed corner.

This was no problem on machines/settings for old printers with makerbot-genes, these have xy0,0 at bed center und default zoom zu 0,0 hits the centered print object by accident.

Dont know if this behavior was itended. Its not mentioned in chancelog, so it look like it was not planned to do.

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CTC 3D Drucker, fabrikator II mini, ultimaker-diy,
Modifizierter Prusa I3 Boxed.
Baubericht im Blog: [blog.gafu.de]