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Thank you, I will see if I can get them to upload it on CTAN to update the style.

You have been very helpful, much appreciated!

I am pretty sure it is pulling an old spie.cls file now, with that knowledge. Here is the output from the log:

Document Class: spie 2007/04/14 v3.25 SPIE Proceedings class

The spie.cls file I am using is labeled as v3.30.

I now know from the path in the log file where to put the new spie.cls ...

I think I have traced the problem to this...

I had the spiebib.bst and spie.cls files in the parent directory, and had:


\documentclass{../spie}

% I had my text here

\bibliographystyle{../spiebib}
\bibliography{../mybibliography}


For some reason, that changed the numbering format of the ...

I am actually using BibTeX, but I tried pasting the output of the .bbl file into my .tex file in thebibliography to see if the problem was with the .bbl file or with the .cls file (or somewhere else). BibTeX generates the following (for the first two entries):

\bibitem{Schott09}
Schott, J.~R ...

I am using MiKTeX 2.9 Package Manager on Windows 8.1 to produce a document (all packages are up-to-date). I have a strange situation where, for some reason, the following two commands are giving different results:

\bibitem{Key} Lastname, Firstname. "Article", Journal, Vol. pages

This results in ...