Although my eReader can cope with books in a variety of formats, it will only let me open those that are in the same format as the most recently loaded book. So even if I have loads of ePUB books on there, if I then load a PDF I can't open the ePUBs. Well, not until I load another ePUB, then I can't open the PDF anymore...
This is rather frustrating.... is there a patch available / planned?