1) I am using LyX 1.5.3 having upgraded successfully from LyX 1.5.1 some time ago.
2) I have now just updated from MiKTEX 2.5 to MiKTEX 2.7 3) I noticed that the LyX Preferences Path prefix: was C:\Program Files\LyX151\bin;C:\Program Files\LyX151\python;C:\Program Files\MiKTeX 2.5\miktex\bin;C:\Program Files\gs\gs8.53\bin;C:\Program Files\ImageMagick-6.3.2-Q16 i.e. it refered to LyX 1.5.1 and MiKTEX 2.5 directories. I assumed this was wrong and changed the LyX paths to reflect the new LyX and MiKTEX directories, i.e. to C:\Program Files\LyX153\bin;C:\Program Files\LyX153\python;C:\Program Files\MiKTeX 2.7\miktex\bin;C:\Program Files\gs\gs8.53\bin;C:\Program Files\ImageMagick-6.3.2-Q16 4) On loading an existing document into LyX I get the following eror message "The layout file requested by this document, article.layout, is not usable." I get the same error message when starting a new document Any help to resolve this problem will be gratefully received Regards, Graham