Together with Ice Bytes Games, I put together a new and improved version of my sailing simulation "Days of Sail: Wind over Waters". Get a free trial of version 2.0 right now.
Looks very nice but there are still a few graphical issues. One is the fact that the reflections don't move with on time when turning the camera quickely. The second is the fact that I experienced a number of problems with the sky. The one time there was a visible seam and the next moment there seemed to be blocks of sky with a different colour over the sky.
Indeed there is a small delay in the reflections and a visible seam to one skycube. The difference in the sky is caused by fading one skycube into another to change the time-period, it is a desirable effect.
The solution would be to align the two skycubes, and make them seamless on both sides, if you provide the to skycube images I could try to make them seamless if you like. It should be possible to fix I think. Anyways, good luck with sales,