Live Preview not working - displays blank page on WP 3.6 via Firefox 23.0 and IE9

[neosource]

Hi,

I just upgraded from 3.5.1 to 3.6 on a new development site (running on http port 8000) with no plugins installed.

When viewing the themes in admin, the live preview feature only displays the sidebar and the rest of the page is blank.

Let me know if you need any more info.

Thanks.

[alexvorn2]

can u view the default themes?

[neosource]

No, not even the default themes appear in the preview. I've removed the 3rd party themes, and it didn't make a difference.

The only thing I haven't checked/compared is a fresh 3.6 install.

[alexvorn2]

Then I think there might be an error that makes the live preview to be blank.
You can change this define('WP_DEBUG', false); to this define('WP_DEBUG', true); in your wp-config.php file to see what errors are there.

[neosource]

I did a full fresh install (new database) and am still getting the same result.
I have tried enabling wp_debug & script_debug as well.
I have tried testing it in multiple browsers. It seems to work in Chrome but not in Firefox 23.0 (all plugins disabled) or IE9.

The only error messages that have intermittently appeared are as follows:

apache error_log:

PHP Notice: ob_end_flush() [<a href='ref.outcontrol'>ref.outcontrol</a>]: failed to delete buffer zlib output compression. in /localsite/httpdocs/wp-includes/functions.php on line 2736, referer: ​http://localsite:8000/wp-admin/index.php

firefox console (not sure if its related though):

Timestamp: 8/08/2013 5:22:12 PM
Error: [Exception... "'Image HTTP->HTTPS redirection to ​https://secure.gravatar.com/avatar/34d428e35f9cc9b5621049e79d86b4f8?s=16&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D16&r=G' when calling method: [nsIContentPolicy::shouldLoad]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "native frame :: <unknown filename> :: <TOP_LEVEL> :: line 0" data: no]

I hope that helps.

[alexvorn2]

can't replicate, maybe you are using an old php version

[neosource]

my server setup is:

CentOS 6.4
Linux Kernel 2.6.32-358.6.2.el6.x86_64
Apache 2.2.15
PHP 5.3.3
MySQL 5.1.69

I'll test it on a hosted account and see how that goes...

[Clorith]

Using live preview on non-default ports will always be messy (and in most cases, result in a blank screen as described) due to security features in the browsers for iframe implementations, also common when using HTTPS (port 443).

[chriscct7]

Since the bug was reported, no one else has been able to replicate this ticket. Furthermore, the bug in hand is likely caused by browser functionality as mentioned in comment:8. Given the lack of anyone else with or able to replicate this bug in the last 2 years closing as worksforme