Lost inventory, armour weapons , lines between blocks at about 1 chunk away

I downloaded 1.8 3/9/2014 pm and initially worked only on non modded profiles, though only have village info mod on forge.
Now when I start game on default or wallbanger2000 non modded (single player survival all profiles) I lose my entire inventory including armour/weapons plus the terrain blocks more than 1 chunk away have black and/or coloured lines around them.
Please respond with possible fix....annoyed I lost the armour/weps all diamond with max enchants no cheats.

Regards

Wallbanger2000