For the last three hours or so, when I see a post in the first post review queue, and click on it, I get the standard left top column menu "Home, questions, ..., appearing immediately above a post up for review, and no matter what action I take, proceeds indefinitely in frozen mode. That is, e.g., if I click to close the post (option below the post), nothing happens, and if I click "No action needed" at the top, nothing happens.
Anyone else experiencing this? I have not experienced this in any of the other review queues.
Edit: now happening also in the low-quality review queue, when posts needing review come up in my browser.
I am using the most updated version of FireFox.
Edit 2: This happened also when I clicked on a post in the "first posts" review queue on matheducators.se.
Edit 3: the same thing is happening when I receive a post in the late answer queue. It renders any action futile.
Another user has posted a similar question to meta.se: Low Quality Post review is unreadable.
Update. The math.se review queue is currently paralyzed in freeze-frame, depicting the users who most recently reviewed in each queue, which has gone unchanged for hours.
Hopefully final update: As of this edit, the problem no longer seems to recur. Thanks to all intervening folks!