Thanks for the response. I solved the problem. But I will share my experience.
Towards the end of 2011, I was excited to know the OOoLatex in openoffice and I was able to include OOoLatex through Tool -> Extension -> Add -> Browse to local disk -> OOoLatex-4.0.0-beta-2-linux.oxt
Then I could create nice Latex equation in openoffice presentation. But to get a high quality equation, I need to put the bakoma font
in the system. Back then in 2011 when I was still using
CentOS 5.2 or so, I need to
wget
http://mirror.ctan.org/fonts/cm/ps-type1/bakoma.zip
unzip it,
and then
mv bakoma /usr/share/fonts
It worked on 5.x CentOS, but I must admit I did not test it thoroughly because soon after that (early 2012) I switched to CentOS 6.1.
Recently, I repeated the above steps in CentOS 6.1 and move bakoma to /usr/share/fonts and apparently this
breaks ps2pdf, xdvi in rending eps files, ...
By removing /usr/share/fonts/bakoma then the problem goes away.
One thing I notice is that the OOoLatex on CentOS 6.1 renders equations EMF perfectly even without having me to install bakoma!
So I guess CentOS 6.1 is really up to date that I can skip bakoma.
I have learned that installing new fonts in the system can break things big time ! Thanks if you are still following me.