Funny, I just did the same thing, but on a linux machine and with success.
Hope I can help you. A few questions/proposals:

1. When you do the reconfiguration of lyx, the program logs on screen what
   it finds and not. What about IEEEtran?

2. What does this report
    $ kpsewhich IEEEtran.cls
   It should give the path to where you put the file. If not, have a look
   at the variable TEXINPUTS. I think it should start with a : otherwise
   the default paths are lost.

good luck
/johan


On Wed, 7 Sep 2005, Rob Chapman wrote:

>   I just installed LyX on my Mac and after all the installing I
>   decided to try it out.  The first template I tried failed as
>   it was the IEEE template.  I downloaded IEEEtran.cls
>   and stuck it in the appropriate place.
> 
>    /sw/share/texmf-dist/tex/latex/base
> 
>   I ran:
>     mktexlsr
> 
>   I also did the reconfigure from the edit menu in LyX and
>   restarted the program.  After all that, I still get the
>   same error:
> 
>    Textclass error
>      The document uses a missing TeX class IEEEtran
>      LyX will not be able to produce output.
> 
>   I'm stuck now but I would like to try and learn this new
>   tool for writing papers.  I have used FrameMaker for many
>   years but it is no longer supported on a Mac so I am
>   looking for alternatives.  Any help is appreciated.
> 
>   Rob
> 

-- 
Johan Ingvast, PhD student http://www.md.kth.se/~ingvast
Department of Machine Design, Royal Institute of Technology, Sweden
http://www.md.kth.se, http://www.md.kth.se/~cas <--- Walking robot proj
tel +46 (0)8 790 95 36  mob. +46 (0)70 34 34 498

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