Major 1. Open any file in assembly view and don't zoom it.
2. Open "Navigation" tab of options panel.
3. Input any number in "Enter position in assembly" field.
4. Press "Go!" button, or "Enter" key.
Current state: nothing happens.
Expected state: assembly view zooms in and shows the region starting with entered position number.
The issue described above isn't reproduced if assembly view was zoomed in first(e.g. showed "well-covered regions").
One more tiny issue is that "Enter position in assembly" field loses its focus after "Go!" button or "Enter" key is pressed. It would be handy for the user to make the field keep focus.