Clicking on tab in Sidewise does not give focus to browser window

I'm not sure if this is something that changed recently, but given that it's happened to me several times and I never noticed it before, I'm wondering if it is. What is happening is that I click on a tab in the Sidewise window, and then if I do a ctrl-R to refresh the contents of the window, the Sidewise window gets refreshed instead, because obviously it still has focus. Not as a big a deal as when I do a ctrl-w to close the window, in which case it closes Sidewise (and I have go to the Extensions tab and disable and re-enable Sidewise for it to come back (it would be nice if there were an easier way to do this).

Is this something that actually changed recently, or am I just imagining things?