When I present text visuals, such as my instructions page, sometimes (on a very random basis) a white square will cover either the right or left half of my screen. This square blocks my instructions from being read.
How can I fix this? I am running simple random stimulus lists, so it is not any faulty programming (I don’t think anyways, and it has happened on 4+ experiments of mine already).
I am working with Windows 7 if that matters.