I have not had this issue and I haven't heard of anyone else having it either...not with invisible equations or with hard to read equations. Do the pdfs look fine? Perhaps you might find a nice set of fonts to your liking in this pdf: http://www.tug.org/pracjourn/2006-1/hartke/hartke.pdf But again, it seems strange to me that you can't see the equations. Chris Murali Krishnan Ganapathy wrote the following on 2006-06-02 19:42: > Hi, > > I just tried my presentation on a projector, and the math is not very > visible. Specifically - is not visible at all. I was using > \usepackage{concmath}to get a set of thick fonts. Is there another font > which is thicker or someway I can boldify all the math. > > - Murali > > >