Both methods suggested are definitely proper methods for deleting a view. That the view you want to delete was created from the original artist view is not relevant. A view is a view and all can be deleted. What cannot be deleted are the top level tree items such as Playing Now, Audio, Images, Video, etc.
I presume you have rebooted at some point to see if that resolves the issue? Sometimes when MC starts to behave erratically, a reboot, or at a minimum a full MC restart (which includes MC server and/or other external servers you might be running) is necessary to resolve said behavior. So I highly recommend you reboot if you have not.
A quick experiment would be to right-click on any view, not just the one you want to delete, and see if it behaves exactly the same. If right clicking does not bring up a context menu for any view, that is problematic all by itself and suggests something else is at play. A right-click should display the menu below.