Hi Mojang,

The issue is the client being unable to update the chunk if it's manipulated in some way by server. For example, if server sets a block to a "Grass" block where previously was "Air" block, the client won't be able to visually load it.

While the client recognizes the block being there, it is unable to load the graphics of the block.

This is a bug that has been around from 1.1 - and I refuse to go over all the bug reports from 1.1 to the current version; so please don't be mad if this has been reported before. I'm just too lazy.

Regards,
Lewis Brindley.