I have the same problem. But only with Chrome (on Mac). The web clipper has an orange/red dot but (left) clicking on the web clipper extension icon does nothing. Right click and I get options etc. and I can see I am not logged in on an account. When trying to clip it tells me I need to logon but I can't get the logon dialogue box to appear. All options identified above do not work, and on my account settings there is no entry for Chrome. I am OK in Safari.