Assuming you didn't get it fixed after you posted this, did you try changing that option to 'Yes' and submitting, log out of the forum, log back in and change it back to 'No'?
I've done that before, without loggin out. Now with loggin out and delete the cookies. Nothing changed. Only in the forum i have the online symbol.
EDIT: After this post "offline" ^^
Thanks for answer, i thing i have to mail