2014-07-22, 07:15 AM
in mybb_theme.xml around line 9955, table has a inline attribute of text-align: center
<template name="private_read" version="1800"><![CDATA[<html>
<head>
<title>{$lang->viewing_pm} {$pm['subject']}</title>
{$headerinclude}
</head>
<body>
{$header}
<table border="0" style="width: 100%; text-align: center;">