LyX 1.5.x erases the temp dvi file

One of my LyX file, I can't understand why, erases the temp dvi file when I want to preview the dvi, so I can't view the resulting dvi. I always get the error message "there is no such xxxyyy.dvi file" (or something similar -- sorry for the exactness, I'm at the office under WinXP). This behavi

Re: Symbol in ERT

The $trick$ did it ! Thank you both for your answer. As for ERT, I had no choice to use it in the beamer class if I want to create a shadowed box containing text. Raymond