I recently had the problem of having blocky water and textures in my just downloaded global base mesh from Orbx. I contacted their support team and they said to replace original Iclookup.bgl file with a new file they sent in the FSX\scenery\BASE\Scenery path. This seems to point to an older file downloaded originaly that was either an old version for the newer global base addon download or a newer file that fits better in the new version. Once I overwrote the original file with the file they sent me the blockines of the textures dissappeard and the water looked a lot better and not like it was pasted in place. It looked more natural. Moral of the story, if you have water and textures that look blocky and you use Orbx addons specially the global base add on, contact the Orbx support team and they will set you that file. I had to send them screenshots of the problem. Hope this helps someone else.
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