Only on Pool? That texture is very common. Pool is very simple, it has very few custom brushes if any, I should imagine, so that is strange, Pool can't be more than 1mb I guess. I only get something like this with movers, seeing behind them and only on some hardware configurations.
Work on DXMP_Pool_v3 has been going very well, I should have a version ready for beta testing by around the end of this month/start of December, would really appreciate some beta testing.