Do they both have to use the same database?
I get this error when trying to use one of the plugins:
QuoteConnection successful.
The database connection is not shared with WordPress.
It depends how u set them up. I'm using Coppermine + Wordpress as well but they don't use the same db. U can check which db they're using in:
Coppermine:
{COPPERMINE_HOME}/include/config.inc.php
Wordpress:
{WORDPRESS_HOME}/wp-config.php
This is not the place for support with Wordpress plugins.