For some reason, I can't break any blocks in Minecraft. They break, but then they reappear and don't drop anything. Iv'e tried restarting and updating, but nothing seems to work. What do I try next?
If blocks are showing the breaking animation, but reappear shortly after you finish, this is usually just a sign of bad lag in Multiplayer. Your client believes you are done breaking the block, so tells the server you have stopped. Due to lag, the server disagrees, and tells your client that the block is still there, at which point it re-appears.