Codex / Documentation Support Forums Support FAQ
Most common cause of this problem is you do not have enough php memory allocated. Gallery2 requires 16MB to run and you can increase the memory allocation by adding the following line to your .htaccess in your wordpress directory phpvalue memorylimit 16M
You can change the URL by changing the "Page Slug" under Manage -> Pages -> Edit for the embedded page. You can also change the "Page Title" while you're there, if you like. If you have Gallery2 Template Caching turned on you will need to flush your Gallery2 Template Cache to force the G2 to regenerate its links, you can do this via the Gallery2 Site Admin -> Maintenance Menu -> Delete Template Cache.
If you would like to redirect your old wp-gallery2.php links to your new embedded page, add the following at the top of your WordPress-generated .htaccess file:
Redirect 301 /wp-gallery2.php http://www.yourdomain.com/wpg2




