Basically, as of 1.9, there is only 1 image for redstone overlay, this is put over every piece of redstone or crossed, when you have a cross. The problem with this is that you can't deal with turns or single dots, like before, and in crosses there is Z fighting. Here are some screenshots to show what I mean. Fixing it shouldn't be that hard, you would just have to switch from the single overlay texture back to two (cross and line) like they had before 1.9. Link with descriptions of below images: http://imgur.com/a/SAQQq