Just in case this helps. Long time ago I had a frustrating issue of starting out some places then the screen would stutter and lose all land and water detail and look like FS4. Sometimes it would fill back in over a minute or two, other times not, and the aircraft was always unaffected. As I have been rebuilding FS9 and trying out different waters, I think I found my culprit. I liked parts of Morewater so I put it in and bang the trouble started and removing it stopped the problem. I remembered I had used it before so there must be a file in there that FS spits out. That would explain why my starting inland seemed to be OK unless there was a large body of water nearby. Hope this helps anyone out there that has this problem.