When I switch between states and suspend/unsuspend different plugins, then sometimes the GUI suddenly appears behind the main Cantabile window instead of in front (where it used to be). On the latest 4059 build.
I use LivePrompter and have the LivePrompter window on the left half of the screen, and Cantabile on the right, with the plugin GUIs being displayed so I can see settings (e.g. drawbars on the hammond plugin). With the new version, if LivePrompter window has the focus, then the GUIs disappear behind the main Cantabile window. If I change focus to Cantabile, then the GUI pops out in front. And it is not docked nor detached, just plain old style.