I had the same problem with not being able to see comments, even in my own thread. I found that the issue was with the language I selected in my settings. I was told to select ‘Undetermined’ but I think this only let me see other undetermined posts and not those who have theirs set to English. So I clicked the big ‘X’ next to them in settings (deselecting any language) and now I see everyone’s comments. Hope that helps.