I just encountered a problem using export lyx to latex (plain). When I export lyx to latex plain, the graphics extension file is not written in the generated tex file. for example, only written \includegraphics[width=0.5\textwidth]{velo-discontinuity-hr} actually the file is "velo-discontinuity-hr.pdf" a journal electronic system cannot find the file because it searches eps/ps by default.
why the extension is not written. Is it on purpose? I use Lyx 2.0.0 in Ubuntu regards waluyo