Disable all and enable all solved the problem. I'm not sure if it's because of the fact that it also involved 'disable and enable this add-on' though. Thanks.
Fixed: An issue with switching between tabs. Thanks @TickTackk Fixed: Added missing phrase. Added: A template modification to change the link to the home page that is in the header of the ACP from text into a icon. This is done to make room for the addon icon that is added in the header.