Minecraft basically broken?

[habbz]

basically minecraft doesn't load parts of the world, it makes HUGE invisible spots. and when i open doors they still look closed Fog doesnt change anything neither does leaving the server and coming back. closing minecraft and re opening didn't work. and this causes Extreme lag. help?
Ive tried it on other computers too same result. and re download doesnt work.

and this is on craftbest

 

[Metrix]

You have extreme lag.

Or a plugin is causing what seems to be chunk errors. Try uninstalling + reinstalling all plugins/mods.

 

[Jincos]

Usually putting a torch down near a chunk error will reload the top level chunks. Try that and see if it helps. Otherwise, you'll need to remove any mods you have installed and add them back one by one to see which one has been rendered incompatible with your client.

 

[Kaz]

If you have the Zombe pack installed and have changed the speed in the 'fly mod' travelling long distances within a short period of time, leaves big holes which take a while to load up, meaning you can see walls/lava/water etc... deep down into the land