PortableApps.com Platform 1.6 "RemainVisible" does not appear to be functioning properly. Added "RemainVisible=True" to PortableAppsMenu.ini and menu does remain visible, but clicking PortableApps.com Platform icon in system tray does not minimize menu.
Feature appears to be functioning properly using PortableApps.com Platform 1.5 & PortableApps.com Platform 2.0 Beta 3.