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Bump, can anyone help?

Hello, I'm having some weird problems with the pdf output of my source file. Sometimes when I typeset the document the font goes wacky, like follows:

http://img.photobucket.com/albums/v312/Juggernaut7581/Picture2.png

Typesetting once or twice more will return the output to normal:

http://img ...

Hello all!
I'm currently in a Linear Algebra class and like to type up my solutions to the weekly homework. I follow the convention in the textbook to write linear operators and vector spaces as captial, sans-serif characters, for instance:

Instead of $T$, we would write $\mathsf{T}$.

So it's ...