Troubleshooting
So you're having trouble with the Posts 2 Posts plugin and you need help. Here's what you can do:
If you've ended up in "It's a bug in plugin X", besides describing the bug, please also include the call(s) to p2p_register_connection_type() that you are making.
If you've ended up in "It's a conflict with the last plugin you activated", besides the call(s) to p2p_register_connection_type() that you are making, please also include the name of the other plugin and it's version.
If you've ended up in "It's a conflict with your theme", try to narrow down the code that you think might be causing the problem (it could be an action or filter in your functions.php file).
The connected posts remain in the wp_p2p table but don't shown up in admin boxes or in front end of site. After deactivating NextGen Gallery, the connected posts are shown again.