I have this exact same issue. Using ZigPress’ solution, the menu does appear, but upon trying to access it, there is an error stating that I do not have sufficient privileges (which I should, since I am the site admin).
For now, the only way that I can access the plugin settings is by manually going to the plugin settings’ URL (ex. http://[my-site-url-here]/wp-admin/admin.php?page=galleries_bwg).
This is a great plugin, but I came very near just uninstalling it and moving on to another plugin due to this. I would assume less savvy users have. When is the fix for this coming?