Max the Great

Title: Mined blocks dissappearing Version: 3.0.3/3.0.4 OS: Windows 7 64bit Java Version: v7 Description of Problem: After a block is mined, the dropped block will either 1.) zoom off in a random direction and stick itself to a wall/ground and become unlootable, 2.) swirl around my myself repeatedly but never actually come into my inventory or 3.) just disappear entirely. These all seem to happen randomly and intermittently, but make mining blocks basically impossible until decides to stop. Any ideas? Error Messages: None Error Log: None