[fel64]

Reinstall won’t help you!

When you log into bb, you also log into WordPress, but not the other way around, right? Trouble logging in is usually a cookie problem.

Add this to your config.php:

$bb->cookiepath = '/';

$bb->cookiedomain = '.example.com';

and this in your wp-config.php for wordpress:

define('COOKIE_DOMAIN', '.example.com');

define('COOKIEPATH', '/');

I think that those are all the things you need to set. Give it a go.

To get www.community.example.com you need to set up a subdomain. This is usually done in your control panel. Bear in mind that some hosts have restrictions on numbers etc.