bug report: different spam_button behavior since 1.4.18 update

Hi all,
 I am experiencing a difference of behavior with the spam_button plugin
since the update from 1.4.17 to 1.4.18

Before:
$sb_move_after_report_spam = 'mail/spam';
$sb_copy_after_report_spam = 0;
(This moves message from a a folder to a spam signaling box)
and
$sb_move_after_report_not_spam = 'INBOX';
$sb_copy_after_report_not_spam = 0;
(this moves a spam from the spam mailbox to inbox)

Since the update, i am just getting a copy behavior, the orignal message
is copied to the destination but is not deleted in the source mailbox.

The spam plugin directory was just copied, including config.php, from
1.4.17 to 1.4.18 during the update.

Thank you if someone what to do to correct this.

Regards



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