join the club, i have the same and had it for months, i talked to tech help here in Australia and they said not all monitors have an inbuilt support for the way TH2G sees the monitor, i wish i could remember what the heck it was called, i download a utility to check and sure enough my Viewsonic Vx922 monitors dont have it, i'll see if i can get the info again as it may be of use to people who are buying monitors for TH2G.
basically it was to do with the start up Th2G looked at comp and sees it, the looks at monitors, if this pulse, standard or whatever the heck it was does not talk back the TH2G sometimes just thinks there are only 2.
i have worked out (and here is a real weird thing) if i open ms publisher in the center monitor and then maximize it across all 3 it 99% of the time kicks in the right monitor (the one that plays up) or i just turn the power button off for around 10 mins and it turns back on again.... i think that at that time the pulse from the monitor is seen by the TH2G and not swamped by the stronger signals from the other two but hey,, it's all smoke and mirrors to me...
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