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on the phone with apple on and off all day... erased hard drive, reinstalled system. Installed 2.2 displaylink drivers.
nothing changed.
in system report, displaylink extensions show up fine. under USB, monitor shows up.
in display system preferences, arrangement tab is up shows both monitors, external monitor in position.
external USB monitor remains dark. occasional flicker. builtin monitor flickers not a lot but some. periodically enough for me to unplug the external before it goes nuts.
running out of options and they don't support USB monitors but have been very helpful. probably done about all i can do to the system software. DisplayLink folks i hope you have some ideas....
gracias
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