7
Ok…solved!
What was the solution?
In Extended Profiles administration-tab fields…exists a field called “attachsig - Always attach my signature”…in registered users was enabled by default. In webmasters was disabled and although you think that you can control it from the tick box of cbb is not true.
So in order to use the signatures you have to set this bit true and then play…
Credits…to a post I read time ago (I don’t remember where…probably in CBB home) that was explaining something similar.