re daand's problem:
this has to do with line 161 in the copperminesc.php file:
define ('CPGSC_TABLE_PREFIX', 'cpg_');
you'll need to change 'cpg_' to be the same as the prefix your coppermine installation uses. For example, version 1.4 uses '1.4x', therefore it should look like this:
define ('CPGSC_TABLE_PREFIX', 'cpg14x_');
I highlighted the change. I use coppermine version 1.4, so that worked with me. Am unsure what previous coppermine versions use, but you can find out by checking out your phpmyadmin and checking what prefix your tables use.