bbpress, back to discussions

1. the “back to discussion” button on the topic forum page links to the homepage instead of back to the forum, where all the topics are displayed.
There is no edit access to the forum page itself, at least i can’t find it.

2. we are using bbpress with s2Member, do you have any issues recorded.

3. Warning: Creating default object from empty value in /home3/sustain/public_html/sustain/wp-content/themes/HighendWP/admin/theme-customizer.php on line 18 ( also on line 15, 16 qnd 17)

we are very happy with the theme, we are newbees, hoping you can help us.
Thank you very much