Hi all. I think I have a bit of a weird one here... I was doing some tinkering on my neighbour's 2010 MacBook the other day, and the jobs I did for them involved switching between their two user accounts. The thing is, when I switched to the wife's account I saw the display suddenly take on a slight cyan colour cast as her desktop photo and dock etc. loaded. The main problem is that the colour cast then remained when I switched back to the husband's user account. The only way to get rid of it was to restart the whole MacBook, but it returned again if I went back to the wife's user account. Is there anything that might be being loaded during the switch to the other account that might be causing this? Or am I likely to have to delete her account and build a new one from scratch? The MacBook is running Mavericks 10.9.5.