Sorry if this already was reported. But it seems that at least some StackExchange are suffering with some technical difficulties and intermitencies in the last 24 hours or so. If this information is relevant, I am trying to access it in São Paulo, Brazil.
See those screenshots:
I also got a similar screen once in the astronomy site, but unfortunately I accidentally closed the tab before screenshoting it.
Further, I am getting frequent errors when trying to fetch comments, post comments, post answers and editing answers. Also, once I got a truncated partially rendered page.
BTW, the very page that I am using now to post this question have a blank text editing toolbar (although the buttons are working and clickable, they are just not visible), probably due to some networking problem. See the following screenshot:
The other sites in my internet connection seems to working normally. The problem seems to be happening just with StackExchange.
Edited, while trying to edit this very post to fix a typo, I got this: