Made a single player and was messing around with some of the new features but I noticed that when I broke a block that the redstone torch was connected to the torch. It seems to happen in random chunks.
Environment
Windows 7 ultimate, Java 6/7 64bit ,16 Gigs ram, amd phenom X2 4 core OC 4.5 gghz, 2 amd radeon 6990's Crossfired
28th duplicate of MC-5711 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.