Hi all, Something strange going on with my iMac. Hard to describe. When I click on any link on my Reading List sidebar, for a split second there is a flickering line which goes across the screen. When I say line, what I mean is, a faint copy of the link below flickers for a split second horizontally across part of the screen. It only happens on Safari (11.1). No other app, so it must be a problem with Safari only. I have macos 10.13.4 installed. I have tried resetting Safari, resetting SMS and PRAM and even deleting the plist file from my Library folder and repairing my disk in Disk Utility...... A short video showing my problem can be viewed here, about 2 seconds into the video...... Anybody have this and found a solution? Thanks in advance!