There is a bug in the "zooming", when the program window is not full sized, ie. double clicking on the window border.
Zooming in / out displays only water.
Tim - I can reliably replicate this in V0.9.5.22182.
1) Set the enroute features tab to auto-hide
2) Click on the main map to hide the enroute features window then on the enroute features tab to re-display the window.
3) Click back in the main map and use the mouse scroll wheel to zoom (only one zoom level) before the enroute window has had a chance to auto-hide (you have to be quick)
Hope this helps to track it down.