Just "upgraded" from version 5 to version 18.104.22.1687 via today's generous Giveaway Of The Day offer.
Confirming that on my XP SP3 MCE system, the Caption Button is no longer appearing where it used to just to the left of the right-corner trio of minimize-maximize-close buttons for the IE8 broswer window frame title border.
Instead the “Caption Button” is appearing to the right of the Menu Bar (File, Edit, View, Favorites, Tools, Help). In this location the settings menu option to move the button to the left makes no sense.
I left a comment to that effect on the GOTD website: http://www.giveawayoftheday.com/sticky-password-6-0/
I got used to and liked its previous more-obvious-and-accessible location, away from the other clutter within the IE window.
Otherwise, I think it's working OK, but I hope the developer can restore the prior functionality, preferably today in time for an update while the free offer is still in force as I'm sure it will affect many people using the Internet Explorer browser.