Hi Hans, thanks for your ample test and report. Actually I'm abroad, and therefore it will be begining next week until I will be able to give a feedback.
At least, I meanwhile noticed that I get two different results whether I use CalClassic or Golden Wings FS. With the first one the shoreline is almost shown as it should be, while the issue appears with GW. For this later I modified the World texture folder. That eventually could be one of the reasons. Anyway, I will give a reply asap.
Bernard