Hi I also stumbled upon this problem. Here are two workarounds that will at least get things to compile correctly: 1. After importing add to the latex preamble in lyx (under Document-Setting) the following : \theoremstyle{plain} \newtheorem{thm}{Theorem} \theoremstyle{plain} \newtheorem{lem}[thm]{Lemma}
This is an example for theorem and lemma. You will find the right things to add in the latex file your are importing so its really just cut and paste 2. Insert text with whatever paragraph style you are missing . Doing this once for every style is enough. For example, go to the first lemma, delete the latex code and mark it as a lemma in lyx. All lemmas will now compile correctly. Hope it helps Guy