Don't you just hate it when stuff doesn't work? Here's some fixes if you do.
Android: For the best experience use Chrome. Androids built in web browser is a bit clunky and can't display some pages or interactions properly.
iPad: Older iPads can't display the gallery. However, iOS 10.1 and above is all good.
I've not tested other mobile devices yet so please let me know your experiences.
Thumbnails not fitting properly? Hit 'All' in the filters and they should pop into shape.
Can't click gallery? This is a rare glitch on older machines. There is a fix though.
Just click a different category, such as 'VIDEO' then click 'ALL' again and you're good to go. Resizing the window works too. Return to the main slide show here.