Each time when I switch on I have to Personalise screen as icons on screen appear badly pixellated with fuzzy edges with text near impossible to read. When I go into "change screen" I find that it has always reverted to "low 8 bit" no matter that I have set and OK'ed it at either "med 16 bit" or "high 32 bit".

Obviously I have some set up wrong and would appreciate advise on how to permanently change this to get it to stay and hold at original setting.