I have turned off all addons/extensions/plugins - still the same problem: 1: Text input boxes appear to be the same colour as the background - and hence "invisible" 2: Clickable buttons on websites are often invisible, or if they display have no text; e.g. button to right of google search ("go" button?) is seen as a plain box with no text - although button is clickable. 3: Google webpage usually has an image - this is missing, and merely has "UK" to the top left of the input box. 4: On this page for example I can see directly above this text box two vertical black lines - it appears to be a button with a pop-up "insert a link" - it can obviously be clicked when I mouse over it.