map loading and blocking placing

i have a Alien Computer so the problem is not the computer but the game
im playing minecraft trying to find some villagers and the map load but the blocks are invisible i try to logg off and load the map again the map go to normal but wen i try to place blocks some blocks turn invisible again i have pictures i hope you kan fix the problem =-D
PS-Thanks for the great updateds and please talk to the mojang team to make a Minecon in Portugal we are waiting for a long time to that Event =-/ .

sorry bad english