Start11 doesn't detect when the screen size of a remote desktop window changes, and the remote desktop display resizes to match the new window. The start button remains offset (this is when the bar is set to centered).
To get it to "re-align" I click the start button, right click the "configure start11" option, and it immediate re-centers upon entering the configure menus. So I just exit the setting dialog and go along my merry way.
Would love for the re-alignment of the start button/taskbar icons to center on resize without having to enter the configure menu and then exiting it.