WPG2 picture insert button in editor brings up "Page Not Found" window

Hi all,

Wordpress 2.8.2, Gallery2 2.3, WPG2 3.0.7. I think I've had this problem since upgrading to Wordpress 2.7. Can't find anything about it in the forums, so I'm making a new topic.

Almost everything works great - I can view galleries from inside Wordpress, the theme looks great, my sidebar block contains pictures, etc. I can use Gallery2 in standalone mode and make albums and upload pictures. No problems, except for the button in the post editor that brings up a window that allows me to insert a Gallery2 picture into my post. A small window pops up, but instead of having a picture chooser, it displays my Wordpress theme's "Page Not Found" page.

I've deleted and reinstalled WPG2, and upgraded Wordpress and Gallery2. No joy.

Anyone have any troubleshooting tips?

The blog is at http://www.gdunge.com. You can see my galleries by clicking on the Gallery link at the top of the page.

Thanks much,

Doug