Dear Radarman,
I went over the thread link you suggested carefully and concluded the following:
a) My effects folder already has a texture subfolder so no joy there.
b) While my scenery/world/texture folder has both bitmap and AGN files in the same folder, the issue of a subfolder does not arise as I checked the original(which I had backed up some time ago) and clearly both types of exist side bt side. Again , no joy there.
So I thought......
I then realised that the detail of the land terrain, within about a 5 to 10 mile radius of the aircraft, actually "fills in" progressivly as I fly. I am now of the view that because the sea is featureless, this "filling in" process manifests itself as square or rectangular slabes of differing hues awaiting to self correct as the aircraft gets to within optimum range. Therefore,I believe its reasonable to conclude the following:
1) there is nothing wrong with either the effects or the scernery/world/texture folders.
2) this is a processor/graphics card/slider settings based problen
or
3) I,ve gone off on a wild tangent and missed the point entirely.
My spec is posted above and is. I believe, probably better than average(I hope).So if its sliders, the question is which ones and by how much?
regards
kevin