The following doesn't harm in any serious way, but it's a curious behavior.
I think Lyx doesn't handle well commands like \left\{, \right\{ \left(, \right), etc. from the user interface. Especially try the ones for braces, you'll see what I mean. Interestingly, when you write first \left( \right), and then place the cursor between the parentheses, Lyx allows you to write between \right and ) for example. it's hard to notice this, as the only visual hint is an invisible slim extra space before ) caused by \right. This causes latex errors. As I said, I don't mean to complain needlessly, but I thought it may help the developers to improve things if they feel it's worth it. Regards, Nusret __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com