If I minimise XMPlay to the tray with shift-N or right click on minimise icon, then when I restore from the rightclick menu on the tray icon, XMPlay is set to on-top, but the info bubles appear behind the window. I have on-top turned off in the options. If it's turned on the info bubbles appear on top.
I'm not sure whether I think it's a good idea to restore to on-top mode from the tray if that isn't already set, so would prefer it to be an option, although I can see why it might make sense. Opening the info window from the tray icon shows the same effect on the info bubbles.
Performing an F-12 refresh after the restore from the tray icon removes the on-top setting and the info bubbles are on-top again.
Hardly an urgent issue.
Mike