I've updated from 1.4.1 to 1.4.2 (self-compiled, Mac OS X, latex contained in fink) and it doesn't find the IEEEtran class.
+checking for document class IEEEtran [IEEEtran]... no However, if I change the line in textclass.lst "IEEEtran" "IEEEtran" "article (IEEEtran)" "false" to "true", all works as expected (the file gets latexed ok). So I guess that my latex configuration is OK. Any clues? What kind of test does Lyx do to search for classes? -- Andrea Censi Web: http://www.dis.uniroma1.it/~censi PGP key #569106B2 available on keyservers.