Hello! First, I apologize for a FAQ, but I didn't came out with an answer.
To switch from LaTeX (Win XP, Miktex, WInedt) to dvi (yap), Shift Ctrl-S or Shift Ctrl-V does this. To switch back, double click in the preview panel in Yap switch back to the corresponding LaTeX-paragraph. Doing so when using Lyx, "no source specials" appears. Is this a temporary bug or does Lyx just sinply doesn't insert source specials? Thanks for your input. Alexander