This is a silly question but did you make sure you have the usb software installed and that your ebookwise librarian program is open before you plug in and turn on your eb1150?
I have had occasional problems with convert lit myself. Did you try using the .oeb that convert lit can produce to import into ebookwise librarian?
If those are not working I would suggest you try the command line convertlit, I had to do that with a book a while back ago it was just very stubborn!
See threads:
https://www.mobileread.com/forums/showthread.php?t=27059
https://www.mobileread.com/forums/showthread.php?t=18049
I have not had terribly good luck in my use of calibre, *shrug* but I don't use it terribly often myself.
Hopefully those threads are helpful!
Amy