I've posted a new build for Simple Gallery in the downloads section (members only).

New Functionality Includes:-

• New option to enable/disable scrollbar for popup slideshow (disabled by default)

Fixed Bugs Include:-

• A random photo will now be correctly selected for an album (a bug caused it not to be random for sub-albums)
• Only approved photos will be shown for the album's random photo
• When logged in with a user that has edit access to the module, the list of albums on the add photo page will be all albums regardless of the IsPublic flag.
• The delete/default buttons on the edit photo screen should no longer appear when changing the radio button options for a single or bulk upload. 

Thanks again for all your feedback!