I upgraded from CQ5.3 to 5.5. Sidekick is empty for my custom site. For the geomatrixx site, it works perfectly.
I noticed there are JS errors while the page is loading - [11:59:57.715] TypeError: design is undefined @ /libs/cq/ui/widgets/source/widgets/wcm/EditBase.js:914
Please help to solve this.
Thanks a lot!