Strange, ensure you've a Joomla menu item with a menu type of Community Builder > Plugins then for Plugin select CB Gallery. Next set Action to Approval. Could be an issue with it loading the approval page incorrectly due to the Itemid used in its URL. Next build release will have some improvements to the Itemid checking behavior when loading Galleries if this is indeed the issue. Will continue to review the code to see if something else could be causing this.