[KingDani]

hello all,
I have some questions, which after some search i failed to find answers to . I have already managed to root the device, put the latest 2.5.1 firmware on it. however,
1. I have no idea why everytime it goes back to the main screen, it asks which launcher should it use. this is frustrating and i would be happy if there is a workaround for this.
2. when opening PDF files, it asks between APDFviewer and viewer, and none of PDF files can be opened by APDFviewer, it tries but comes back to shelf list one second later. is it a known bug? i would really like to use the screen rotation capability of APDFviewer, so any suggestions?
3. in nookmarket, the only way i can go back to previous menus, or get out of, is to do a reset. is there a close of back function on this app? if so, can anyone help me with finding it?
4.i have managed to use Calibre to convert PDF files to EPub, but not CHM and DJVU files, is there any decent program to do so?

many thanks