Greetings all,
First of all, as my first post on this list, let me thank you a lot for the wonderful work you're doing on LyX. It really is an awesome software, which only gets better with each release since the 1.0.4 I first used :-) Now to the unpleasant words. I'm using the latest available 2.1.0 beta, binaries for Windows, running on Windows 7 64bits. Using MiKTeX 2.9 as backend, as up-to-date as I can tell. Create a new document, choose "Beamer" as document class (though the following troubles seem to happen also using the standard, default class). In "Fonts", choose "Use non-TeX fonts". Create a frame, give it a title, and enter a word or two. When using "View PDF (LuaTeX)", I get an "Undefined control sequence" error. With "View PDF (XeTeX)", I get more details: --8<-----8<-----8<-----8<-----8<-----8<-----8<--- \define@boolkey {polyglossia}[xpg@]{localmarks}[false]{% The control sequence at the end of the top line of your error message was never \def'ed. --8<-----8<-----8<-----8<-----8<-----8<-----8<--- Then some more errors. In "Document settings"/"Language", I choose "Always Babel" as "Language package". Now the PDF preview works fine, both LuaTeX and XeTeX. Now emphasis (Ctrl+E) one of the word: the preview fails with "Undefined control sequence", message: --8<-----8<-----8<-----8<-----8<-----8<-----8<--- The \emph{text} here.\end{frame} The control sequence at the end of the top line of your error message was never \def'ed. --8<-----8<-----8<-----8<-----8<-----8<-----8<--- ...both LuaTeX and XeTeX. The error occures even when using "Text style"/"Emphasis". However "Bold", "Alert", "Structure"... work fine. Reverting to non-styled text makes the preview work fine again. Now in "Document Settings"/"Fonts", try to change one of the fonts, e.g. set "Roman" to "Times New Roman". The preview fails again with "Undefined control sequence", details: --8<-----8<-----8<-----8<-----8<-----8<-----8<--- ...mainfont[Mapping=tex-text]{Times New Roman} The control sequence at the end of the top line of your error message was never \def'ed. --8<-----8<-----8<-----8<-----8<-----8<-----8<--- The same occures when trying other fonts, either LuaTeX or XeTeX. Setting the font back to "Default" makes the preview work fine again. Just hope this will help the beta to mature in an unmatched new release :-) Best regards, -- /- Yves Bailly - Software developer -\ \- Sescoi R&D - http://www.sescoi.fr -/ "The possible is done. The impossible is being done. For miracles, thanks to allow a little delay."