After a working break of a couple of weeks, I start do work on my last project. But I can not edit my postgis-layers anymore! Its possible that I did several system-upgrades, and maybe there was also a postgis-update, and I updated to QGIS 2.12 but I can not exactly tell, what could be the reason.
I have the right ownership of the table and all Privileges (arwdDxt*)
As you can see in the editing-bar - I can not make any changes to the layer