[OS X TeX] mktexpk error

[academic]

Hi, 

When I try to typeset one of my tex files using pdflatex (Version 3.141592-1.21a-2.2), mktexpk gives me error 
messages such as the one I attach to in the end of this email.  I have tried to resolve this problem, and I can't find an 
answer yet -- why it says "Mismatched"?  Isn't ljfour supposed to be 600 dpi?  

If anybody could give me any suggestions as to where I should look for or what seems to be going wrong?  

Thanks in advance!

-Ken Nakatani

====sample error message====
</usr/local/share/texmf/fonts/type1/bluesky/cm/cmr10.pfb>kpathsea: Running mktexpk --mfmode / --bdpi 600 --mag 
1+120/600 --dpi 720 xipasl10
mktexpk: Mismatched mode ljfour and resolution 600; ignoring mode.
mktexpk: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1+120/600; nonstopmode; input xipasl10
This is METAFONT, Version 2.71828 (Web2C 7.5.4)
(Fatal base file error; I'm stymied)
grep: xipasl10.log: No such file or directory
mktexpk: `mf-nowin -progname=mf \mode:=ljfour; mag:=1+120/600; nonstopmode; input xipasl10' failed to make 
xipasl10.720pk.