I crafted a magic crayon (OpenBlocks mod) and whenever i held it/used it, my friends around my base claimed that their stuff (such as chest and etc) were going crazy and weird or even flipped. Its hard to explain so i got some screenshots from when my friend only held the item in question aswell. I dont know if the other colors of crayons does the same thing, I've only crafted yellow ones. Glitch - Imgur As you can see it makes crazy stuff happen, and my friends claimed that they had bad lags (down to 0 FPS)
That's from the 1.6.4 -> 1.7.10 mod update. The issue exists with ender backpacks too. Just don't use it until it got fixed.
