WordPress update broke plugin

I suddenly have the same problem, but didn’t update WP…

I’ve the same problem that has been noticed only this morning.
My quick and dirt workaround was to edit the file:

wp-content/plugins/issuu-pdf-sync/inc/class.admin.php

and comment the following lines (about 375):

if ( !isset( $form_fields ) || empty( $form_fields ) || !isset( $attachment ) || empty( $attachment ) )
         return $form_fields;

As far as I could understand, WP 3.5 modified the attachment_fields_to_edit hook behavior and the $form_fields variable does not get passed anymore.
Commenting out those two lines made it work for me, but I don’t know if it’s going to break something else.

Thanks Kernel75!
This solution worked for me!

Hopefully benjaminniess will update the plug-in soon!

We have forked the plugin to GitHub and did some improvements for WordPress 3.5:

https://github.com/pronamic/wp-issuu-pdf-sync/commit/a3bfabd5904e3d99cc8eba2e0a58bf72ae25aac8

You can download the develop version from the following URL:

https://github.com/pronamic/wp-issuu-pdf-sync/archive/develop.zip

The developer @benjaminniess has given us access to the plugin. We will try to update the plugin next week and solve the known issues.