I get the dreaded:
Unable to automatically step into the server. The remote procedure could not be debugged.This usually indicates that debugging has not been enable
I have just had the same problem. In order to be able to debug a WCF service, you should add the line in the server's config file inside the section.
For more details, please check the link: http://msdn.microsoft.com/en-us/library/bb157687.aspx