SNAP broken (possibly after changing permalinks structure)

[Micha]

I installed and used SNAP 3.1.0 fine for a few weeks.

Yesterday Facebook updates stopped (expired token), the day before it still worked fine. So I went to the settings page to try to re-authenticate Facebook and discovered the settings are partially broken now.
eg, one of the image links is this:

https://www.micha.name/blog/wp-content/plugins/usr/share/wordpress/wp-content/plugins/social-networks-auto-poster-facebook-twitter-g/img/Next_Scripts_Logo2.1-HOR-100px.png

Presumably due to this malformed URL issue I can no longer configure the plugin. The settings button for an individual account no longer opens the settings for that account.

It looks like the plugin is attempting to access (some) files appending their FQN to the WP_CONTENT_URL.
I have upgraded the plugin to 3.2.3, but still the same issue.

Site-specific (and possibly relevant) config:

WordPress 3.6.1 running on a Debian server using the Debian-suggested configuration layout.

config.php:

define ('WP_CONTENT_DIR','/home/micha/public_html/wordpress/wp-content');
define ('WP_CONTENT_URL','https://www.micha.name/blog/wp-content');


htaccess:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>


directory:

$ ls -la /home/micha/public_html/wordpress/wp-content
lrwxrwxrwx 1 micha www-data 39 Dec 13 14:32 plugins -> /usr/share/wordpress/wp-content/plugins
lrwxrwxrwx 1 micha www-data 39 Dec 13 14:32 themes -> /usr/share/wordpress/wp-content/themes/
drwxr-sr-x 3 micha www-data 63 Feb 14 09:54 upgrade
drwxrwsr-x 4 micha www-data 28 Jan 1 03:47 uploads


Any suggestions on how to fix?

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