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Your description of the erractic Envisage behaviour is much like mine was after upgrade to 5.85 - previous to u/g, I had the DSI plugged straight into the USB of laptop and it worked fine but not after. To cut a long story short, the erratic s/ware came good after I plugged DSI into a powered USB hub (as well as turning out images with more colour in them). It seems that the DSI needs 500mA from the port and mine was JUST making it b/4 the u/g but not after. If the DSI is not getting enough juice, it will send erratic info for the s/ware. Also, it seems that though some laptops that claim to provide 500mA , the supply wil actually reduce if the current is shared between ports (so if you plug something into other port, the supply to the DSI is decreased by that amount.
Like you, I uninstalled/reinst etc, so if you are not already using a powered hub, try it.
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