Thanks for such a quick reply.
Okay, when I am reading and I get to the pages I am having problems with (ES font & unable to change pages) it just seems to lock in to that page. Even waiting a few minutes makes no difference. The symbol comes on briefly & I still can't turn the page or change the font size. It still shows the font as being in whatever size I have pressed but the print is still ES. Also, pressing the page turn button won't work either. You are right, they are PDF's. But it is only on some pages that I have problems.
Now to the battery!!
I phoned Sony and unfortunately, I listened to them about the 3 hour charge. I agree with you, I always believed that the batteries trickle charged for a few hours more. Sony said no, they don't, it could damage the battery by leaving it on!! So, I took it off after 3-4 hrs. Now I suppose I will have to get a new battery sooner than I should!!
With it charging every time I connect to the computer, how do I get the books to it?
I think that is about all!!!!

Actually, should I change the PDF's to ePub? Can I do that?
Thanks again