That is very strange. We are aware that a popup saying "Upgrade Required" is erroneously appearing for several people, and we are currently tracing the issue and looking for the cause. However, in all our other reported cases, the operations did, in fact, go through (though sometimes it required a user to wait a few seconds and retry it). In all our testing, and in all the reports we've received until now, this issue seemed isolated to only the newer article editing interface.

For the public presentation not loading, can you tell me what error message you are receiving? "An error" sadly does not tell us very much (especially because I have not been able to reproduce this issue).

For article sorting, I have been able to reproduce the issue, though it is intermittent on my end. The leading suspect for the "upgrade" message being triggered when it shouldn't seems to be connected to this as well (I think they're both symptoms of the same issue, and am trying to test that to verify). Do you get any error messages when you try changing the sorting mode? Particularly, inside the component in red text?