prefered_name() -> preferred_name()

I post this issue here, since I've found it when upgrading LEAF skin in order to use it with this amazing alfa version.

Both in _feedback.php and _main.php we find:

->prefered_name()

In _main.php (line 123) there is:

<span class="item1"><?php $Item->Author->prefered_name() ?> </span>

In _feedback.php (line 178) there is:

<strong><?php $current_User->prefered_name()?></strong>

This seems not to agree with Phoenix. If I remove this piece of code, all goes well, but author's name isn't displayed anymore, not at the end of every post, nor in the comments page :°

Any hint?

Thank you,

Francesco