Occasionally the world will load, I will see the sun and moon only. I can Hear actions/players/mobs around me. Other players can see and interact with me. However I can only see particle effects. The terrain won't load. I've waited as long as I can and it won't load. Side note, if the terrain loads initally upon my death and respawn there is a chance that it will do it again.

PS. Upon my death sometimes the terrain will appear but the npcs / mobs will not appear but still be there (ie invisible mobs attacking