I'm running Affinity Photo with official version 1.6.5.135 ... i've deinstalled or reinstalled it at least 5 times now - no change in behaviour explained below.
As long as i work with photos/graphics inside Affinity Photo everything seems fine. But when i save my done images (doesn't matter if tiff, png, jpg ...) the saved image gets saved with a whitebalance shift of about 20% towards cold temp. But when i load this same image back into Affinity Photo v1.6 , the image whitebalance gets set back those 20% in the warm temp direction, so it's looking again, like it's suppose to.
If i load those temp-wrong saved images into another graphics software like PaintShop Pro for instance - then there is no temp-shift happening. PaintShop Pro shows the image with that 20% cold temp shift - like any Windows 10 image-viewer, too.
What tells me, that there is something wrong in this version, is that i've downloaded the beta version of Affinity Photo - version 1.7.0.258(beta) . And silly as it is, Affinity v1.7 doesn't reproduce this error - it's working fine and flawless and saves and loads the images without any errors or color temp-shifts. So that's why i'm working now only with the beta version v1.7 of Affinity Photo - the v1.6 version is useless now with this error - and like mentioned above - even after de- and re-installation this problem doesn't disappear.
Is this a known error the Affinity team is aware of, or does that only occure on my PC and Windows 10 Pro ? But since any other graphics program doesn't do this color-temp shift (Affinity Photo v1.7..., PaintShop Pro, Gimp, Paint.Net, Adobe Photoshop CS2 ....), it has to be mostly software related, then being a problem with my PC or Windows 10 ...
Take a look at the images - the grey moon is what you see in Affinity v1.6... and the blue-color moon is what gets saved (and looks exactly that way loading it into Affinity v1.7 or PaintShop. And if you take the blue looking moon and load it back into Affinity v1.6, it's back to normal grey - so i wonder, what happens here, even in a freshly new installed Affinity v1.6 ???