No "Send move" button?

Since this morning, in the (right now, only one) game I am playing, I no longer see the Send move button, in order to continue playing.

FYI, it is this game. It is a DnB game; I have no idea if this affects other kinds of game too.

Does anybody else experience this? Any suggestion?

Thanks,
M.

To elaborate a bit:

This happens to me accessing the site via Firefox (latest version) running under Linux Mint 19.

Neither has been updated since yesterday, when everything was still working correctly.

Oh well, it seems OK again now.

Probably I did something stupid without realising... Sorry for the noise.

Hi,
I never noticed before but the "Send" button only appears once a move is made.
Maybe you were attempting to play :
- an illegal move ? (something like closing a box in "dots an boxes" which forces you to play further)
- no move at all ?

Yes, quite possible. I tried several times, reloading the page and restarting the browser. But there many ways to be stupid... and I probably tried several of them!