Steps to reproduce the issue

• Backend
• Go to modules > Administrator modules.
• Deactivate all modules of type "User Status".
• Open module "Title" of Type "Title" (many others have the same problem but type "Custom")
• Click on button Save & Close to open dropdown submenu.

Expected result

• Dropdown opens.
  

Actual result

• Dropdown doesn't open. Can't select "Save and Copy" etc.

Additional comments

• I think it's missing JQuery and/or bootstrap(?) that is loaded by module "User Status" with following line:
  HTMLHelper::_('bootstrap.framework');