Jean-Pierre Chretien wrote:
However, I never noticed that I have to close the last display of a pdf in Acrobat to be able to view the new one (I get the message "I can't write on foo.pdf" until I close foo.pdf.
You might want to look at http://wiki.lyx.org/Windows/LyXWinTips#toc1. Being too absent-minded to reliably close AR each time, I've found this quite valuable.
/Paul