There is something wrong with LaTeX output of some textclasses. I can
reproduce this, for example, with beamer, when trying to view the file
beamerpresentation that is shipped with the beamer package (in the
"templates" directory).

It turned out that LyX is erroneously outputting commands as _environments_.
Consider the following diff between the LaTeX output of 1.3 and 1.4:

+\begin{title}
+Presentation Title
 
-\title[Short Title (Optional)]{Presentation Title}
-
-
-\author[Short Author Name (Optional)]{Author Name\inst{1} \and Another
Author\inst{2}}
-
-
-\date[Short Date (Optional)]{Date}
-
-
-\institute[Short Institute (Optional)]{\inst{1}Institute\and
\inst{2}Another Institute}
+\end{title}
+\begin{author}
+Author Name\inst{1} \and Another Author\inst{2}
+
+\end{author}
+\begin{date}
+Date
+
+\end{date}
+\begin{institute}

whereas, for instance, title is defined in beamer.layout as

# Title style definition
Style Title
  Margin                Static
  LatexType             Command
  InTitle               1
  LatexName             title
  ParSkip               0.4
  ItemSep               0
  TopSep                0
  BottomSep             1
  ParSep                1
  Align                 Center
  AlignPossible         Center
  LabelType             No_Label
  OptionalArgs                          1

  # standard font definition
  Font 
    Size                Huge
    Series              Bold
    Color               Blue
  EndFont

End

I guess we should have a look at this before 1.4

Jürgen


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