I have some mathstuff like \mathds{R}, for doublestroke characters for sets (package dsfont) before 1.2 this was done with \mathds{, because lyx does the closing parenthesis by itself. so far so good: 1.20 converts this to \mathds{ in tex(red) and the rest in blue. therefore I get a lot of errors. Herbert -- http://www.educat.hu-berlin.de/~voss/lyx/