An old error that just manifested for me: when you make a new thread, after a certain amount of time typing your post you get a little box which shows some moving squares, as if the browser is busy doing something, but it doesn’t go away and it locks you out of typing or pressing buttons. The only option is to use the back button on the browser and start again.
I remember this happening very frequently some time ago, it just happened to me again, so it’s not entirely fixed.
Comments
This is something to bring to the attention of @Linc ...
Those dots indicate it's trying to save a draft, I believe. You might try clearing your browser cache / restarting your browser if you hit it more than once in a blue moon.
Unfortunately I'm not currently able to update our existing software without breaking the search feature entirely, so even if that bug was fixed (and I kinda doubt it was) we couldn't get that update.