Version:
Prince 11.1

Overview:
Vertical text are not rendered properly with font "Songti TC".

How to reproduce:

<style>p { font-family: "Songti TC", serif; writing-mode: vertical-rl; }</style>
<p>關羽（西元160～162年－220年），字雲長，本字長生，漢末三國時劉備的重要將領。</p>

Result:
Anything other than kanji would be misaligned to axis, appeared a little bit "floated" relative to text.

Note:
This is tested on OS X El Capitan (10.11) with Songti TC Regular (v11.0d1e1; 2015-07-10), which is the default system font for serif characters.

1. screenshot.png‎ 17.4 kB

Thank you for the test case, I think some other Chinese fonts exhibit similar alignment issues. We will investigate this when we revisit vertical writing support later this year, sorry for the inconvenience.