Sama en el blue y en el green la loguinbox encontré un error en la plantilla header_welcomeblock_guest no me permitía loguear por lo que vi había un error en action="{$portal_url}"
header_welcomeblock_guest original
<div id="panel">
<form method="post" action="{$portal_url}" class="text_left">
<input type="hidden" name="action" value="do_login" />
<input type="text" class="textboxreg" name="username" value="{$lang->login_username}" style="width:35%;" onblur="this.value = this.value || this.defaultValue; this.style.color = '#ccc';" onfocus="this.value=''; this.style.color = '#000';" />
<input type="password" class="textboxreg" name="password" value="{$lang->login_password}" style="width:35%;" onblur="this.value = this.value || this.defaultValue; this.style.color = '#ccc';" onfocus="this.value=''; this.style.color = '#000';" />
<span class="float_right;"><input type="submit" class="button" name="loginsubmit" value="{$lang->welcome_login}" /></span><br/>
<label title="{$lang->remember_me_desc}"><input type="checkbox" class="checkbox" name="remember" value="yes" /> {$lang->remember_me}</label>
</form><span class="float_right"><a href="{$mybb->settings['bburl']}/member.php?action=lostpw">{$lang->lost_password}</a> <a href="{$mybb->settings['bburl']}/member.php?action=register">{$lang->welcome_register}</a></span>
</div>
Así lo arregle y funciono todo
<div id="panel">
<form method="post" action="member.php" class="text_left">
<input type="hidden" name="action" value="do_login" />
<input type="text" class="textboxreg" name="username" value="{$lang->username}" style="width:35%;" onblur="this.value = this.value || this.defaultValue; this.style.color = '#ccc';" onfocus="this.value=''; this.style.color = '#000';" />
<input type="password" class="textboxreg" name="password" value="{$lang->password}" style="width:35%;" onblur="this.value = this.value || this.defaultValue; this.style.color = '#ccc';" onfocus="this.value=''; this.style.color = '#000';" />
<span class="float_right;"><input type="submit" class="button" name="loginsubmit" value="{$lang->welcome_login}" /></span><br/>
<label title="{$lang->remember_me_desc}"><input type="checkbox" class="checkbox" name="remember" value="yes" /> {$lang->remember_me}</label>
</form><span class="float_right"><a href="{$mybb->settings['bburl']}/member.php?action=lostpw">{$lang->lost_password}</a> <a href="{$mybb->settings['bburl']}/member.php?action=register">{$lang->welcome_register}</a></span>
</div>