My problem is solved by installing PilzAdam´s Minetest build:
http://forum.minetest.net/viewtopic.php?id=4547
but with the xyz´s one the problem still remains so I will use PilzAdam for my Acer.
tinoesroho wrote:Does this happen on launch or when you launch singleplayer?
I think shading is broken. Go into the "settings" tab, turn off shaders (god, they're useless).