Hi @hellodeer,
Please contact us with your system info.
Email us at support@ slickremix.com and include your current shortcode & system info, you can do this in your WP dashboard, by going to Feed Them > System Info and then copy/paste. (*note: please close the gap in the email address before sending)
We would also suggest you look at the error.log after the issue happened to see what error is being reported. The plugin should be compatible, however possibly there is a function that was overlooked that is now coming to light. But having the error log data will be important. Please include that info as well, this can help us to find/debug your issue.
Best regards,
The SlickRemix Team