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Hi Stefan

Thank you vey much for your welcome...and for the solution. It was exactly the problem. Once identified it was easier for me to delete the character, but I keep the tweak for next time.

Anyway it's amazing because I was using Lyx' default font...it let you write some characters that it ...

Hi all

I have a document composed of 3 child inserted documents. Each four document is "book (Tufte)" class and has the same preamble.
Pdf of each separate document are showed without problem, but when I try to show the whole it throws me an error:
Package textcomp Error: Symbol \textrightarrow ...