Can confirm that.
Regarding modes, they don't work, because sometimes there is no appropriate class in <body> tag.
For example, on 'All categories' page the class exists and specifies 'Cozy' mode:
But when I go to this 'Migration ...' topic, there is no any class that specifies current mode:
This causes page size changes. Left sidebar becomes larger and smaller while browsing between different forum pages. Very stupid and annoying.
UPD: and what's interesting is that when I open this topic, there is no class in <body>, but if I jump to the very beginning using timeline, it ... appears 
Are you gonna fix what you've broken?