I had exactly the same problem in two sites: Global Configuration page is showing without any layout or buttons.
That worked for me:
A bclass.php file placed in:
After removing that file, the Global Configuration page went back to normal.
Apparently this was a file from when the site is hacked.
Click on the **mod_quickicon_global_configuration** and that should take you to the Global Configuration where you can select the second tab across, **COM_CONFIG_SYSTEM**, and then change the second field under **COM_CONFIG_DEBUG_SETTINGS** change to **JNO** and then click Save.
Or you can edit your configuration.php for your site and change