-A more serious reason could be a syntactical error in your input.
- If necessary, redo the last editing steps, using
-\emph on
-Ctrl-z
-\emph default
-, or try to translate the
-\begin_inset ERT
-status collapsed
-
-\begin_layout Plain Layout
-
-
-\backslash
-LyX
-\end_layout
-
-\end_inset
-
--file into
-\emph on
-dvi
-\emph default
+A more serious reason could be a syntactical error in your input (in that
+ case, the math edition area disappears completely).
+ If necessary, undo the last editing steps, using
+\family sans
+Ctrl+Z
+\family default
+, or try to translate the LyX-file into
+\family sans
+DVI
+\family default