The "Submit" Button in the Activity Box has Disappeared

Team WPMU,

In the Activity Box, the actual button to submit the post is not showing. Normally, as soon as you start typing, the box opens slightly and the "submit" button appears in the bottom right corner of the Activity Box.

However, this is not happening. You can type, but nothing appears. However, it should be noted, that BP Activity Plus works fine. This problem occurs whether BP Activity Plus is active or not (though currently active, because it's better than nothing).

All plugins are up to date. Support is Granted.

Would appreciate you taking a look.