Ok, I tried with another random book and the "px" unit, and it still doesn't work. I attached a copyright-free book as a sample, in which I created a new class (.sizetest) used only in the 2nd paragraph of the 1st chapter, so that you can compare/test it.
I also checked if I had any strange options enabled in the Viewer, but they seem to be normal.
Ok, I tried with another random book and the "px" unit, and it still doesn't work. I attached a copyright-free book as a sample, in which I created a new class (.sizetest) used only in the 2nd paragraph of the 1st chapter, so that you can compare/test it.
I also checked if I had any strange options enabled in the Viewer, but they seem to be normal.