pskiebe

I can confirm, that the fix mentioned by MrMountain fixes the issue. Plugin 2.3.4 on WP 4.2.1

thanks for the advise, i notified him as suggested. for anyone interested in my modifications, have a look at my blog post regarding wspsc.

*facepalm*
Thanks a lot, that was exactly the problem. I inserted the wp_footer hook:
wp_footer();
in my theme’s footer.php just before the closing </body> tag and erverything is working smoothly now. panel.js is added to the footer as it is supposed to without any modifications to the plugin code.

Thanks for your reply. After digging deeper into your code I see now how such a custom field filter would complicate things. Here is my solution for the described problem:
Use the Private! plugin together with Custom Field Template. Create a custom field and populate it with wordpress usernames (the process is described here). Now you can filter posts in your template as described in this article. Don’t forget to filter your categories and feeds too. The last part requires some coding but after it’s done you can easily define fine-grained access rights for your private categories.