Adding bibliography environment adds key-2[] at end of document rather than Bibliography

[Graham Smith]

I changed class from book to article and the bibliography broke. No 
references appeared in the Bibliography section when compliled and the 
in text citations compiled with a "?"

I deleted the environment and tried to re-add the bibliography but 
intead of getting the bibliography "button" that allows you to link a 
database, I am getting

References
key-2[]


If I open an existing citation there is no database listed, I have tried 
shutting down and reconfiguring, but I guess I am doing something more 
fundamentally wrong here.

Can someone explain what it is.

Thanks,

Graham