When viewing the edit posts list in the admin, if I quick edit a post and click update, the change are saved and the quick edit box collapses, but the the whole row disappears.
This happens in WordPress 3.0.5 (haven't tried in a lower version) with all other plugins disabled running Twenty Ten theme.
http://wordpress.org/extend/plugins/wordpress-seo/
I can only confirm same behavior for me. Runing 3.0.4 and Yoast SEO 0.2.1. When making a change using QuickEdit and saving the row for that post is removed from the posts list. Upon refreshing the display it returns. Not a big deal but Yoast does seem to create issues on the re-display after a round-trip saving changes to posts - I'm posting a new comment on issues with full editing.
This should be fixed in 0.2.3, coming later today.