I've given access to guests to view thumbnails only, so you should be able to see the gallery now.
This does allow the strip on the forum mainpage to be displayed before and after people login, however even when logged in as a user, if you click on one of those images, it takes you to the gallery but you are not logged on.
So, this is where is doesn't make sense, if I click on the Gallery link in the navbar (when logged on as a user), it takes me straight to the gallery, logged in perfectly as the same user.
But if I click on an image link from the (now newly displayed) gallery main page strip, it takes me to that gallery BUT not logged in.
Moving forward at least...