If you are connecting to Opticraft using 1.8 right now you may experience a few issues. Anvils will not work properly and A few blocks will look like pink and black errors. For now you can change back to 1.7.10 to get anvils to work until the issue is resolved.
topic showing how to change version of minecraft: http://www.opticraft.net/index.php/topic,18708.0.html
topic showing how to change version of minecraft: http://www.opticraft.net/index.php/topic,18708.0.html
