I´m using macOS Sierra ver 10.12.2 and Lyx 2.2.3 (LyX-2.2.3+qt5-x86_64-cocoa.dmg).
When I try to incorporate .bib files using: Insert, index, BibTex Bibliography. In the option "add" (add a database), Lyx is locked, does not incorporate the database, can not continue to write. This problem not exist with (LyX-2.2.3+qt4-i386-carbon.dmg). Best regards, Héctor Armando Esquinca Avilés Universidad Autónoma de Chiapas México