Hi,
sorry for late reply, it was night for us

Can you please post me your site details? you can use the form below the reply in "Site Details" tab.

Blank page means PHP error, so please add details to show PHP error log (often the error.log file is located in the site root)

Hi,
There is nothing in the php error log. You can enable the display errors option in the backend.
Also there is php_errorlog in the root dir.

Hi,
in the blank window we have a Javascript code to close popup and reload page like this:

<script type="text/javascript">if(window.opener) ........ </script>

This code is replaced by this:

<script type="text/rocketscript">if(window.opener) ........ </script>

You can see the changed output on all entire site (see screenshots of your src code), this work on normal template but not on Raw template (also used by Ajax).

So you have some plugin that rewrite output of javascript.

It is Cloudflare.com that does that, but how come everything works perfectly besides this? I saw the output on the blank page.
All right disabled it and it works.

Thanks

It is Cloudflare.com that does that, but how come everything works perfectly besides this?

On all page works because there are header information, with raw mode Joomla return only component output.

I think that your plugin should check Raw mode before change output. Raw mode can be used for many purposes and it is a part of Joomla API.