When opening a world blocks will become glitched, they will disappear or show blocks not where they belong.

{+}{+}when I open a minecraft world, no matter brand new or pre existing, the blocks will disappear, the lighting glitches, the menus like inventory and chest menus flash. The main menu is fine as well as the world selector. The bugging out only begins about a minute in to playing a world and does fix it self for a few seconds when I reload.