None seems to report such behavior so it could be problem in my system. When I try to break v1.1.0 execution with CTRL+C during measuring or for example when I'm in monitor setting menu of dispcal, it halt for around 10 seconds and later quit with "Segmentation fault". Never had such problem with v1.0.4, specially check it just before posting and problem wasn't there. But I think it's minor bug since I was able to profile my monitor without issues and I surely can wait 10 or even more seconds for program to quit :) You've did a great job, Graem! Regards, Denis http://forum.weblamp.net