Sometimes after upgrade, there is an issue when no action (List Items/Revise Items/Relist Items/Stop Items, etc.) selected in Action drop-down run.

There are several possible reasons for such a situation:

• your browser cache - it can be cleared by pressing a combination CTRL+F5;
• your firewall - please, check if it is not blocking the javascripts;
• permissions set on Magento folders (i.e. not sufficient permission set for javascript folder js) - please, check the permissions;
• enabled options Merge JavaScript and Merge CSS in System > Configuration > Advanced > Developer for Magento v 1.x and in Stores > Configuration > Advanced > Developer for Magento v 2.x - please, disable these options.

Please, correct your settings and try to run the action again.