Seen the same issues on Mac and Linux, but it's particularly vexing on Windows since the recent (April'17) Miktex 2.9 release: Lyx 2.0/1/2 used to work flawlessly for years before the new miktex release.
Now it needs multiple re-installs, remove miktex, re-install miktex, reconfig Lyx, check Tex (still fails), check/edit Paths, reconfig again... even the Lyx install bundle fails to do any better... :-( Lyx was a great tool, yet the current issues w/ paths, Tex compilers, missing styles etc. started long ago (similar reports from a decade ago). Now they're aggravated by whatever Miktex has changed in miktex-2.9.6236 Can we help somehow to fix this hurdle? I can't tell my colleagues and students to keep trying to fix a broken Lyx/Miktex install ... until they get it right :-) cheers and thanks for Lyx! Cheers, Mitch -- Mitchell Gusat - IBM Zurich Research Laboratory Saumerstrasse 4, CH-8803 Rueschlikon/Switzerland Phone1: +41-44-724-8568 Fax: +41-44-724-8578 Master Inventor, Internet: gusat@{acm,ieee}.org