We’re having the same problem at our site which is using the Dante Child theme… and it’s a standard install other than that.
From any of the Pages or Products, while in Swift Page Builder, we click on the shortcode icon and get a 500 error (video attached).
Permissions are 666 for /wp-content/themes/dante/swift-framework/sf-shortcodes/interface.php
Same result if permissions are 777 for /wp-content/themes/dante/swift-framework/sf-shortcodes/interface.php
Memory set to 128mb in /wp-config.php
Apache Access Log entry:
66.229.186.28 - - [05/Jan/2014:20:25:15 -0600] "GET /wp-content/themes/dante/swift-framework/sf-shortcodes/interface.php?ver=359-20131026 HTTP/1.1" 500 19137 "http://www2.hirewheel.com/wp-admin/post.php?post=12042&action=edit" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36"
/.htaccess is standard with no “deny from all”
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress