Tom Schlangen wrote:

> Hi Lyx/Win Users,

> please be aware that updating MiKTeX 2.7 to current patchlevel as present in 
> its repositories since 09. July will leave you with a broken backend - you 
> will not be able to get any output - not even from the LyX help files. Tried 
> on 3 different XP machines.

> LyX/Latex error output will be:

>    Undefined contro sequence.
>    LaTeX Error: Missing \begin{document}.

You just have to rebuild the formats[1], since some language specific
definitions have changed. Then everything should be working fine again.


[1] Button 'Update Formats' in 'Miktex Settings' dialog.

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