I think this is a bug. I am experiencing this as well, on a 4-core i7 with 3Gb RAM with recent ATI 3D graphics running no other programs. I find it hard to believe it's specification related. I'm also playing single player, so lag should not come into it.
My solution is to reduce the size of the window in which Minecraft is running. At full screen or near full screen, the problem occurs. I'd say about 30% of the time I lay extra blocks. Reduce the window size to around 75% of the screen and the problem is immediately gone. I'm running latest Minecraft on Ubuntu 11.10 64-bit with the ATI proprietary driver. I'm using default graphics settings in the game.
Could other posters let me know if this helps them, and their OS?
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My solution is to reduce the size of the window in which Minecraft is running. At full screen or near full screen, the problem occurs. I'd say about 30% of the time I lay extra blocks. Reduce the window size to around 75% of the screen and the problem is immediately gone. I'm running latest Minecraft on Ubuntu 11.10 64-bit with the ATI proprietary driver. I'm using default graphics settings in the game.
Could other posters let me know if this helps them, and their OS?