Hello all! I'm new here, but I just really need some tips! I've been an editor/proofreader for 5 years and have gotten great reviews from everyone I've worked with. I've been heading up a website project over the last month or two for a specific client while still proofreading for about 3 other clients. ONLY with this website client do I continually miss errors. It's always missing words (simple things like 'autoimmunity is dangerous because it the source of many diseases'). Proofreaders don't miss errors like that. I personally don't miss errors like that. Except with this guy. Continually. I don't understand what the difference is. I read slowly and carefully, multiple times, out loud, tracking a pen across the screen. And I still miss them, but again, only with this guy. I'm so baffled and frustrated I just don't know what else to do to catch these. Any tips?