There was multiple updates on 1.7.4, but i've noticed that on all of them, when you destroy a block, about 10 Game Ticks after, it reappears. For example: you are in a jungle, blocked by trees. You destroy the Leaves, and clear a path, but all of a sudden, you teleport right back to where you were when you had mined those leaves. So far, Entitys aren't affected.
Related issues
duplicates
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A crash report wouldn't help!

A forced crash-report gives us information about your system so that we can check if anything isn't up-to-date.

everything is up-to-date

In order to check what's possibly wrong, we need a forced crash-log and Console output.

fine. oh, my java is actually 1 ver short. But it won't crash.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) here.Also, please attach the complete output of the "Development console" tab of the launcher.
Click the text, press CTRL-A to select all, then CTRL-C to copy, and CTRL-V to paste in a comment on this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".