This glitch is allways occurs when a block is dark. Its kinda handy but
can be annoying sometimes. Also, more annoyingly, my sound is all
messed up, causing all noise to sound like weird metal music. I've
looked around but haven't found any info on it. Any help?
 Oh yeah I have a mac
 http://imgur.com/Y7Th1.png

http://imgur.com/6uZw1.png