Hello, While creating a new layout, I had an error (\theoremstyle missing). Jean-Marc pointed out that this was defined in amsthm.sty. Checking AMS in Document->Settings is useless, this does not load amsthm, only amsmath and amsfonts.
I guess that this patch --- amsmaths.inc.orig 2008-03-07 18:52:57.501637000 +0100 +++ amsmaths.inc 2008-03-07 17:43:27.941890000 +0100 @@ -68,6 +68,7 @@ Series Bold EndFont Preamble + \usepackage{amsthm} \theoremstyle{plain} \newtheorem{thm}{Theorem}[section] EndPreamble should have been applied long ago. I understood that 1.6 will use a different syntax. -- Jean-Pierre