Yes I am using Buddypress
This is what I am experiencing in a user gallery. At this time I have no Group Galleries yet but I think it would be no different.
There is no next song when I click the audio album cover. If I choose the audio album name and then a song, I can see a name of the next song on the lower right of the player.
Also there is no next or previous option when viewing photos a person has to use the arrow keys on a keyboard to advance.
Other notable issues or bugs: When uploading images or video from the activity area or the group area, by chance I discovered the hard way that I must include a description or the upload fails without a reason. And also if there are certain characters not allowed it again fails without reason.
I am using The BuddyX theme