No to those questions. And nothing changed in my devices or network, today is the first time I've experienced that issue.
Weird aspect is that from the any page, although none of the thumbnail images display, if I click on the 'Following' tab, the room previews do show up from the drop-down list. But none of them are there if I go on to click 'Show all' and load the followed room page.
Anyway, thanks for the suggestions and interest, I will just see if it resolves itself