Having already done some text highlighting, as well as some copying (to paste into a Word document for Bible class notes), when I press mouse to select text in my open commentary I get the prohibitory circle (circle with slash through it). This has happened before and seemingly after a period of time, I was able to select. But today I've only been able to highlight six separate times in this particular commentary. I'm working from my church PC Lenovo. I opened my MacBook Air up, and while I see my six highlights, I am still prohibited from selecting any text in this particular resource.