logging into opera sync with a freshly installed opera-beta results in missing all of the unsorted bookmarks. This got me worried, since I have quite 'a few' of them so I checked the sync.opera.com webpanel. The bookmarks are there, you just can't see them in generic opera bookmark folders. However, using a third party bookmark extension (in this case - V7 Bookmark) allows you to see all of the missing bookmarks in Unsorted category.
Is this expected behaviour?