One user reported that the app's save functionality was broken, and they were correct. For nerds, a reference to the current file's path was being lost because I was simply using a `filepath` query param that I opened the app window with, and this was being lost. Now that reference is being stored in application state as it should be, and saving works consistently.
I've also rolled out drag+drop functionality for bib files with this update. Basically, if you open a bib file with BibTex Cool, and you want to import all the references from another bib file, you can drag+drop that other file. You'll be prompted for confirmation.
v1.1 is live on the Mac App Store now.