Tag, caption, annotate pictures and images on your WordPress blog.
Another cause could be that the plugin could not find your wp-config.php file, which is required for it to work.
Malformed tags could also be the culprit.
This is a known issue in Opera, wherein the script could not recognize the right-click mouse action.
Only users with admin access are allowed to add/edit/delete tags.
You are free to play around with the CSS file included in the plugin package. (wp-pictagger/css/style.css)