We have renderings which have compatible renderings configured. The button in the Experience Editor (Sitecore 8.1 Update-3) shows up on our local development environments and renderings can be replaced without problems. However on our testing environment, the button is gray (disabled). What could be the cause of this?
I searched for the command to look in the code what could be the cause of that. I see that it executes chrome:rendering:morph but I don't find a class which maps to this command. Anyone knows which command this is? It seems that something causes the command to be disabled.