I setup CPG 134 in my local net for testing. There is a lot to configure, so I used default-values most time.
After clicking on a thumbnail I get these warnings:
Warning: implode(): Bad arguments. in /var/www/cpg134/displayimage.php on line 334
Warning: implode(): Bad arguments. in /var/www/cpg134/displayimage.php on line 336
http://forum.coppermine-gallery.net/index.php?topic=20933.0