[When white is not white ;)]

Hey guys, problem solved  As Haakoo correctly identified although my monitor was set to 'RGB' when i went into colour management it was using the default colour profile supplied by Benq. Switched it to sRGB IEC61966-2.1 and everything is as it appears. I guess none of the other packages I used before used these settings which is why I haven't encountered this problem in the past. Thanks for all your help on this.

[When white is not white ;)]

Hi,

Monitor is a Benq GL2450 and the settings in Windows 10 are as follows

[When white is not white ;)]

Hi, yup my settings are all the same as yours. Really struggling to understand this. It's not my monitor because in Inkscape, Paint.Net, Gimp etc everything is as it should be. As you can see from my photo in the original post the canvas is pure white. It just seems Affinity Designer won't let me create images that are pure white or to be more accurate won't display them. 
I have attached examples below. The first image is a screen capture of how the image is displayed inside AD, the second is a screen capture of the image when it is exported from AD.

 

[When white is not white ;)]

Hi, yes we already tried that and his settings are exactly the same. Doesn't seem to make any difference what settings I select for the document or the preferences

[When white is not white ;)]

Hi,

I have a really weird issue with colours not displaying as they should. If i create a new document the background paper is displaying correctly as bright white. If I then draw a square box for instance the colour inside the box is a warm cream, even though the colour settings in RGB Hex are set to FF for all three values.

If i save the file and send it to a friend who has AD as well when he opens the document he sees, correctly a white square on a white background. There is no difference between the square and the background. This is obviously something wrong with my settings in AD but I can't figure out what.

all the best

Jonathan