I am having the same problem in Chrome.
I also am not receiving emails to subscribed threads. I unsubscribed and resubscribed, but I'm pretty sure I'm still not getting them.
Admittedly, I am a technical nitwit, but clearing the cache, restarting machine, nothing has helped yet. That being said, I did update to Windows 10 a few weeks ago, but I believe it was working fine until the last week.