I recently upgraded my OJS installation from 3.1.1.2 to 3.2.0.1 and after the upgrade, I realized that my sidebar, containing different block, isn’t displayed anymore.
I’ve cheched every block plugins and they’re are enabled and also checked that my sidebar in appareance settings is set.
If it is not this plugin it may be some other plugins causing problems. Do you have access to the php error logs? There you should see an error message.