DAN - I´ve tried to compile without the high prec setting, but the level is even worse.

GARY - In my computer with A5, the high prec works better than without on large levels!

- without high prec (*.wmp) blocks that I made are totally out of sync (stretched and displaced).

NEUTRONBLUE - yepp, I´ve placed the blocks from all the 3 directions!

Thanks for all ideas and questions, but still if someone has more ideas or has experienced the same please write something!