Board Thread:General Discussion/@comment-25335834-20150516214756/@comment-25428589-20150517121550

Do you mean the "Reply" button disappears when you try to press it? I have also experienced this issue. Luckily, this CSS fixed it for me:

Add that to Special:MyPage/global.css and it should fix it.

Oh, and if you're having the same issue with forums, add this as well (it's a bit glitchy: use at your own risk):