Unable to select any text

Hi folks,

I had asked this question originally back in mid July but didn't get a useful answer.

Can anyone tell me why the 'select text'  for highlight / add note to text / copy functions is not working? When I right-click the popup menu appears and the aforementioned options are shown but shaded light grey - ie I am not allowed to select them. I'm doing a lot of academic reading and having to resort to PEN AND PAPER to make notes/highlight - HELP!

Thanks J