Ah, I see. Thank you. Looking into the log, I see there is indeed an error:
! Package inputenc Error: inputenc is not designed for xetex or luatex. (inputenc) only UTF-8 supported. So presumably it is a bug in the preview mechanism - it should not try to include "inputenc" if xetex/luatex are used, right? Should I file a ticket about it? > (Note: This is a repost from lyx-users, hoping this list will be more > > helpful) > > > > Hello, > > > > I'm having a problem with math previews in lyx 2.1.2 - in certain documents > > (possibly all documents set to be compiled with xelatex) there is no > > preview for math. > > > > When running from terminal I get the error in the subject: > > > > Warning: xelatex had problems compiling lyxpreviews?????.tex > > > > repeating a few times for various files. Locating those files in > > "/tmp/lyx_tmpdir..." I can see there is a valid PDF for each, and running > > xelatex manually on them works without any error. > > Note also that on the same machine lyx 2.1.0 does not have the same > > problem, and the same documents have previews. > > > > What could be the problem, and how do I solve it? > > This is due to http://www.lyx.org/trac/changeset/64e0c558/lyxgit > > I don't think that was a good idea, because the document preamble > is also used for producing the previews and, even if latex has > some problem, it may be something unrelated to math and the correct > result may still be produced (which I think is the case here). > > You could try deleting those couple of lines added in the changeset > above by using a normal text editor for editing the scripts. > > -- > Enrico > >