Sorry for multi posts. This forum doesn't allow editing or adding to an existing post.
I can see it clearly in the "Events" app. if you go to Events grid and select a row and click on Edit, the form comes up. If you click on Cancel, nothing happens. Hit it again it goes away. But if you pull up the same form, click on Cancel and goes away for the first hit, but for a fresh row, it doesn't take first click.
It doesn't happen on all forms. Just some forms. And in Document app, the form closes and reappears again. Strange!