DisplayCAL

I just downloaded & installed v. 3.5.  v. 3.4 worked successfully recently.  Win 10 Pro with Fall Creators Update installed (probably after last use of v. 3.4).  Tried both DTP94’s that we have; same result: “Error – dispd -> read returned error code 3”.

v. 3.5 launches, enumerates the DTP94. Told it to start calibrate & profile. It presented first three patches (black, white, gray?), then went to error message box.

CANCEL. Win 10 had updated the Display Card driver. I reverted to the previous driver and Display Cal 3.5 is now working.