[AlexBell]

I haven't used my Kobo Glo for weeks, and found this afternoon that setting the font size doesn't seem to work. On most of the ebooks the font size is very small, and when I try to increase the font size either nothing happens even when I move the slider to the large font end, or the font becomes enormous. And it is sometimes very difficult to get the indicator circle to move anyway.

Is there a manual to show me what I should be doing? I can't find anything on the reader itself, or on the Kobo site.

Is it possible to 'reboot' the reader to go back to whatever settings were there when I bought the device? I have backups of all my ebooks, so I don't care if I lose them all.

I have synchronised the ereader, but that doesn't help.