Histogram does not show sometimes in the histogram window when the image has been loaded in the program. When I do a levels adjustment to the image the histogram does not show in the levels window. I have to export the image, close the program and then restart the program and then it works again. When it does work it take up to two minutes to show the histogram. The program is now running really slow since the latest upgrade to 1.84.693. I am on Windows 10.