So, I uploaded bbpress, configured config.php, punched bb-admin/install.php in my browser and saw... nothing. Not even an error message.
Ok, I went poking around. Deleted config.php and got the error message as expected.
Next line in the code is: require_once('../config.php');
I do not believe I get over this hurdle (if I recall correctly, require_once dies quietly).
I changed it to require config-sample.php, and got as far as database error message. config-sample.php and config-php sit next to each other with exactly same permissions.
I cannot think of a reason for require_once to see one but not the other...
Mystery...
Any ideas?