Jose, I suspect that this one is a result of your parser changes. I'm getting warnings:
LyX: Bad boolean `0'. Use "false" or "true" [around line 19 of file /tmp/lyx_tmpdir199946DJAXR/19994hn2iuH] LyX: Bad boolean `0'. Use "false" or "true" [around line 22 of file /tmp/lyx_tmpdir199946DJAXR/19994hn2iuH] LyX: Bad boolean `0'. Use "false" or "true" [around line 33 of file /tmp/lyx_tmpdir199946DJAXR/19994hn2iuH] 18 \paperpackage a4wide 19 \use_geometry 0 20 \use_amsmath 1 21 \cite_engine natbib_authoryear 22 \use_bibtopic 0 23 \paperorientation portrait 24 \secnumdepth 3 25 \tocdepth 3 26 \paragraph_separation indent 27 \defskip medskip 28 \quotes_language english 29 \quotes_times 2 30 \papercolumns 1 31 \papersides 1 32 \paperpagestyle default 33 \tracking_changes 0 34 \end_header -- Angus