Gift from our programmer...
--- google-picasa-albums-viewer/wp-google-picasa.php.orig 2012-06-04 10:47:09.000000000 -0600
+++ google-picasa-albums-viewer/wp-google-picasa.php 2012-06-04 10:47:53.000000000 -0600
@@ -36,7 +36,7 @@
// Include required files
include 'classes/class-PicasaAPI.php';
- define( 'PICASA_PLUGIN_URL', WP_PLUGIN_URL.'/'.str_replace(basename( __FILE__),"",plugin_basename(__FILE__)) );
+ define( 'PICASA_PLUGIN_URL', plugin_dir_url( __FILE__) );
if ( !class_exists( 'WPPicasa' ) ) {
http://wordpress.org/extend/plugins/google-picasa-albums-viewer/