You simply can't have applied the workaround
correctly. It has worked for everyone else. It's also worth noting you would have to apply the fix to each style, including child styles in case they have been edited independently.
Yep, all sorted now. I was searching for xengallery_media_view.css which only returned one result. However I didnt realise that I then had to select each style using the drop down on the right (see my last image) and edit each one ... I kinda twigged as Chris replied as I wondered and realised why only one style had been fixed... doh!