Maybe you can guide me into which kind of details would be needed to properly diagnose my issue.
From time to time, when I try to answer comments on Space, I'll get stuck with the blue saving bar at the bottom of the page - it never stops loading no matter how long I leave the tab open, and if I go check my posts, indeed, the affected one is not there.
I have Chrome, FWIW.
I suspected it could be related to poor connection on my side, but this is not the case especially lately, and my Internet seems to be working perfectly well while that one tab doesn't.
Other people seem to be able to answer in the same thread in the meantime.
Retrying won't work for a while. Then, at some point later, it will magically allow me to instantaneously post again.
If you are having this problem: the thread below elaborated on how it could be related to ad blockers and similar software, and offers solutions.