Plugin not working anymore

Since WordPress updated (itself) the Bol plugin that was working, does not work anymore. The plugin screen opens and I can choose productlink or bestseller. But when I press the search button it does not show any results.
I have several sites and it is not working on any site.

For example: http://www.plusrubriek.nl

https://wordpress.org/plugins/bolcom-partnerprogramma-wordpress-plugin/