It took a while, also Illustrator had troubles with the library-panel. I used the cleaner and reinstalled the Adobe CC app. That fixed it, for now 😉
So, it's june and again Library and Share pallets don't work in InDesign. It makes me sad. Specially I've got my client able to work with the share workflow.
Again going back to export to PDF and client making corrections and I doing them in InDesign making PDF version 2... etc...
Result: In Bridge and Creative cloud app the library is back! But in InDesign still a black library palet... Also the Share palet is black. So it seems two different but related bugs are in the system...