>>>>> "Yann" == Yann Le Du <[EMAIL PROTECTED]> writes: Yann> Hello, I use version 1.0.1 Yann> I have found the following bug that has caused me some Yann> problems. If you ,wrongly, type, in math-mode : Yann> \ left ( x \ left ( The (easy but not relevant) answer is that you should use ``M-m ('' ;) Yann> (I have added some spaces for readability in this mail) where Yann> the mistake is that you should have written "right" and not Yann> "left" to close the parentheses, then save the document and Yann> close it then open it, then, on the command line of the window Yann> from which I launched Lyx, lyx says there is an error : Yann> " Math parse error: unexpected '_' " The mathe parser is indeed not robust when it comes to reading malformed LaTeX code. The reason is that it has been designed to re-read what it generated by itself, not to understand any random sequence of macros... I agree that it should be more robust however. Alejandro is busy rewriting math support, but we have not seen the code yet, so I cannot tell you whether there is hope in this area. JMarc