I've left a page open for ten minutes or so trying to get a stuck script to complete, to no avail. What happens is that a script is trying to do something and can't, for some reason, so just displays a continuously rotating pair of black arrows on a white background underneath the last post, with that page then locked up, even when reloaded.
Here's a screen shot showing the problem; the round black arrows are continuously rotating clockwise, with no way out of it other then to log out and then back in again. Going back to that thread results in the same thing happening again at the bottom of the thread, locking it up again. It only seems to happen on some threads, AFAICS (it's not yet happening on this one, for example):
