And once again, I am afraid this problem has reared its ugly head yet again. In my case it was working as it should for ages, until today. All of a sudden my colours are not exporting correctly in either png or jpg. The only difference between today and that last time I used Affinity Designer is the latest Windows 10 October Update! I certainly agree with the original OP and MadByte that this program should just work. Gimp, Inkscape, all the freebies work out of the box, so to speak, and I expect a paid for program to do the same.