there are few issues with this file:

1.sometimes the add-on water may flicker and change color.

2.some buildings are incomplete.

3.The ends of the rivers have coastlines visible where they meet with the sea.

4.Some Gmax buildings may appear bright white when viewed at large distances.

5.The terrain mesh may have "holes" visible near the bodies of water.

6. Rivers and waterways have bumps, this is due to the slightly incorrect
placement of the river and it may be corrected in the future releases.

7. Some buildings "hover" above ground... this is a flight sim, NOT a walking sim ;)