Hello, Upon the first reboot after the 10.13.6 upgrade, the TV connected to my mac now displays pinkish or purplish images, while my ordinary monitor is fine. When I use the TV by itself (driven by cable TV, not by the computer) the colors are normal. The computer is a 2009 Mac Pro with a RX560 which has been working fine for months on 10.13.5, and the TV is a Panasonic flat screen which has been working fine for years. The two of them are connected by a DVI to HDMI cable that has been working flawlessly for years. I've found on the net that some PC and apple TV users managed to switch the color space or HDMI frequency, but I can't seem to be able to do that on my Mac. Thanks for any help.