I have a Wordpress site that also has Gallery 2 embedded via the excellent WPG2 Wordpress plugin.
Unfortunately, while editing the gallery in it's embedded form via it's Wordpress page, changes made to the gallery do not show up. I see the number of WP-Cached pages increasing as I view the gallery (which is normal, I believe), but it would seem that these cached pages are being served up to me. This is while I'm logged in to Wordpress as admin, so I shouldn't be receiving any cached pages at all.
Is this behaviour known about? I am happy to help in testing/fixing the issue. Just let me know how I can help! (I am a competent programmer).