(OK...My English is poor. Sorry)
When AS (AstralSorcery) and OptiFine are installed the same time.
then I tried to open the book and zoomed in. when I close the book.
It showed like this.

Even the words.

I'm sure it's true.I removed OptiFine. then it ran well.

Plantform: Ubuntu 14.04
MC ver: 1.12.
AS ver: 1.6.1

Disable OptiFine's "Fast Render" option. #72