Re: Problems using same tables for wordpress and bbpress
DON’T do that!
You want bbPress and WordPress to have different table prefixes in their respective config. bb_ and wp_ , the defaults, are fine. If you try to use the same table prefix, some of the WordPress tables get destroyed due to a collision between table names because both software packages now use the same table prefix (posts , usermeta and users tables, I believe.)
What are you trying to accomplish that requires you to use the same tables for WordPress and bbPress? If you are looking for integration, this is not how you do it. With an integrated install, you still use a different table prefix for bbPress but you insert your WordPress table prefix in the bbPress config.php a little further down in the file. Then, bbPress modifies the existing wp_users and possibly wp_usermeta table.