Can you be more specific? What is the error message, the log entries, what exactly "is not working"?
Did you try to recompile those plugins with the latest version? Without knowing what the custom code is doing nor any error or log message it's nearly impossible to help.
I would suggest to open a support ticket and provide all those details with it.
I am unfortunately not seeing errors in my logs, but for the items and product webui plugins I use the property post setter method and that is what is not working in the new version. Everything was recompiled.