That was it thanks!
I can't believe I've been running at lower resolution. I'm going to look around Florida and Netherlands again now. I had been whinging to myself about the low resolution terrain for low flight. Perhaps I've been missing out.
EDIT: While this fixed this specific imagery, the existing Florida and Netherlands terrain appeared the same.
This is probably because the standard resolution of most photoreal terrain is 1 m/Pixel which is roughly equivalent to Aerofly Level 14 resolution. The developers stated that their Turkey Point scenery was created at Level 15 which roughly equals 0.5 m. If you increase the resolution by two, the file size will be quadrupled because it's an area. Now look at the file size of your Netherlands and Florida imagine you'd need four times the disk space. Level 15 is normally reserved for small areas where people are likely to fly low, but it's not really feasible for all scenery unless you have a huge hard drive. Also, most of the orthoimagery freely available by the USGS is at 1 m / Pixel resolution, with small areas at a better resolution. Higher quality source images are usually only available from commercial vendors and very expensive, so noone could afford to buy the Addon anymore if the developers wanted to make a profit from it.