Hmm, I am not sure what you mean exactly RateU, so I will give a bit more info:
I have a Custom Profile Field, fid6. It is a textarea field. As far as I know, without this plugin, then it is not possible to use BBCode in Profile fields.
I have a template conditional in my postbit:
The text from the profile field does display only if there is a value, and it was all on one line, no new lines. So I added the <func nl2br> in the postbit conditional. However, if there is a mycode in the text then it does not display formatted. Eg