? Natbib/Bibtopic Multiple bibliographies error

[John Robert Hudson]

Using RC~1 and today RC-2 with Multiple bibliographies per section set, I get 
a LyX warning that there are undefined citations in all but the first section. 
Looking at the LaTeX log, I find:

Package natbib Warning: There were undefined citations.

Package bibtopic Warning: Please (re)run BibTeX on the file(s):
(bibtopic)                Vol_25_1.2
(bibtopic)                Vol_25_1.3
(bibtopic)                Vol_25_1.4
(bibtopic)                and after that rerun LaTeX.

John