Sometimes when I want to log in or type something in a search box, and then move on to another field (eg typing username first, then the password) I just get/see empty fields. When I click on one of those "empty" fields, only then I can see the text I typed in. When I want to check a box to choose an option in some kind of a form, I cannot see whether it's marked or not, it always looks unmarked. Sorry for this strange explanation, but I cannot explain it even in my mother tongue