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[Pat McGowan <pat.mcgowan@xxxxxxxxxxxxx>]

So it only happens if all conditions are met:
Font is Ubuntu and Qt falls back to Droid Sans Fallback (which is from package fonts-wqy-microhei)
Pixelsize is 69 as computed from the 50GUs and Grid Unit size of 23
Font weight is Light

Random characters are not shown.

Seems a bug in Qt's font fallback logic - similar report at
https://bugreports.qt.io/browse/QTBUG-32470

Can someone try on Wily?

** Attachment added: "Main.qml"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1475205/+attachment/4432959/+files/Main.qml

** Also affects: qtdeclarative-opensource-src (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-font-family-sources (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1475205

Title:
  Random Chinese character missing with Ubuntu font

Status in Canonical System Image:
  Confirmed
Status in qtdeclarative-opensource-src package in Ubuntu:
  New
Status in ubuntu-font-family-sources package in Ubuntu:
  Incomplete
Status in ubuntu-ui-toolkit package in Ubuntu:
  Invalid

Bug description:
  After applied 50 GU setting in image, we started seeing randomly
  missing Chinese characters across scopes and apps header, not clipped
  at the begin or end of string, sometimes in the middle.

  STEPS:

  1. Switch display language to zh_CN in system settings
  2. Reboot the phone

  EXPECTED:

  I should see all header strings displayed properly.

  ACTUAL:

  Randomly missing character.

  VERSIONS:

  current build number: 51
  device name: arale
  channel: ubuntu-touch/rc-proposed/meizu.zh-proposed
  last update: 2015-07-16 04:59:10
  version version: 51
  version ubuntu: 20150716
  version device: 20150709-8965e37
  version custom: 20150716-819-9-6

  ---------- update ----------
  The problem of missing characters can be reproduced even on a desktop, outside of the header, without importing Ubuntu.Components:

  import QtQuick 2.0
  Item {
      width: 800
      height: 600

      Text {
          anchors.centerIn: parent
          text: "系统设置 one two"
          font.family: "Ubuntu"
          font.pixelSize: 69
          font.weight: Font.Light
      }
  }

  The problem only appears to occur with this specific combination of
  font family, pixelSize and weight. Tim Peeters reproduced the problem
  on vivid on a laptop without changing the default settings for the
  language (LANGUAGE="en_US").

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