Notifications, comments, and my product page's old posts all broken for two weeks — anyone else?

For about two weeks now I haven't been able to access notifications, reply or comment properly, or see my older posts on my product page. Tried incognito and a completely different browser — same result both times, so it's not a local cache/cookie issue on my end.

Checked the (unofficial) status page and it shows all systems operational, so this doesn't look like a known outage. Wondering if this is isolated to my account or if others have run into the same combination recently. If it's just me, any pointers on what to try next would help.