Had the same issue and spent the day nutting this out. Tried the above Jazmo detailed but couldn’t get it to work so looked a little deeper into it.

There’s an even simpler solution that I got to work and its to replace line 233 of tinymce-advanced.php

$plugpath = WP_PLUGIN_URL . ‘/tinymce-advanced/mce/’;

with

$plugpath = $blog_url . ‘/wp-content/plugins/tinymce-advanced/mce/’;

I can now add tables/images without getting blank popup windows.

Works only with 3.2.7