My history window no longer appears at login and I can't select Show History from view window, the Show History text is greyed out. I can still access SQL history in a database but it is much easier to view and name my history when in the application.
I have the same problem with SQLA 15.0. I have had access to the History window for as long as I have had SQLA installed. The other day, I closed the History window, and "Show History" is grayed out.