This has been discussed on the forum several times: the scenery has been optimized to run with realistic zoom settings, which are around 0.60-0.70. This doesn't mean that you can't use wider settings, but in some places details will disappear because of the LOD optimization, which is related to the zoom setting so, we guarantee that if you use 0.70, everything should display. If you use a wider setting, it usually works, but not everywhere.
There's nothing you can do, this is not a bug, it's how the scenery has been designed. Perhaps we might do a patch to increase the usable zoom settings, because users might have more powerful PCs than compared to 2010 when KDFW was released.