Paul
Well, I have something to propose. I still have no idea how you
managed to change margins before (it should have been grayed out),
unless maybe you're on an older version of LyX. Since I could not
change margins, I could not reproduce your results.
If you are using 1.6.x, though, I may have an answer. The attached
file is a replacement for the article-beamer layout file. Drop it in
your local layouts directory and reconfigure/restart LyX. It should
enable you to adjust paper type/size and margins in "article (beamer)"
the same as in any article. I've tested it both by converting
existing presentations to articles and by using the embedding method
in the link that Jürgen provided.
I'm using 1.6.2, on Ubuntu 9.04 and none of the margin/page controls are
greyed out, so I can already adjust paper type/size and margins in
article (beamer) as in any article. It was just that these then needed
set back to "default" when switching back t Beamer.
Strange isn't it.
Thanks for your help.
Graham
