Release 1.4.12, which should reach the stores over the next day, fixes a bug introduced in 1.4.10 (sorry, 1.4.11 didn’t quite catch all cases, so please give 1.4.12 a try).
A setlist containing an empty line caused LivePrompter to freeze during sync – not very nice 😳. Until you get this release, try to avoid empty lines in setlist files. I don’t really see why you’d have empty lines in setlists anyways 😉…