M. Kupiec wrote: > Yesterday i have totally uninstalling the factory usb divers and other > stuff and install standard windows drivers. That didn't help to . > Changing usb port to built in usb 3.0 device caused that the device install > drivers, but argyll cant find the i1pro. > > The last issue it the 1,5m i1pro cable that is not orginal but work fine > with i1 and other pc. > What else can i try to get chartread work?.. Hi, it sounds like a difficult problem, since there is little to go on. There are two approaches to getting some more clues - either get a more detailed trace, or try changing parameters to see if anything has any influence on the problem. The former requires a hardware USB trace. The latter means varying certain things. For instance, I suggested making up a chart with very short strips, to see if that behaves any differently. You haven't said if you've tried this or what the result is. Another thing to try is to increase the timeout value and see if that has any effect. To do this you would change line 7275 of spectro/i1pro_imp.c from extra = 1.0; /* Extra timeout margin */ to extra = 10.0; /* Extra timeout margin */ recompile, and see if this makes any difference. Graeme Gill.